Libyan Desert Glass Tektite Meteorite Impact Glass LDG Lybisches Wüstenglas 18 g

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Seller: classicrocksandgems2 ✉️ (5,418) 100%, Location: Morsbach, DE, Ships to: WORLDWIDE, Item: 162315460655 Libyan Desert Glass Tektite Meteorite Impact Glass LDG Lybisches Wüstenglas 18 g.   Libyan Desert Glass - LDG - Sahara Desert Translucent yellow - green complete specimen Weight : 18.23 grams              Size : 37.1 x 29.4 x 18.4 mm

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    Thing of beauty: Tutankhamun's Pectoral with desert glass scarab In 1996 in the Egyptian Museum in Cairo, Italian mineralogist Vincenzo de Michele spotted an unusual yellow-green gem in the middle of one of Tutankhamun's necklaces.  The jewel was tested and found to be glass, but intriguingly it is older than the earliest Egyptian civilisation.  Working with Egyptian geologist Aly Barakat, they traced its origins to unexplained chunks of glass found scattered in the sand in a... remote region of the Sahara Desert.  But the glass is itself a scientific enigma. How did it get to be there and who or what made it?  The first atomic bomb detonation, at the Trinity site in New Mexico in 1945, created a thin layer of glass on the sand. But the area of glass in the Egyptian desert is vastly bigger.  Whatever happened in Egypt must have been much more powerful than an atomic bomb.  A natural airburst of that magnitude was unheard of until, in 1994, scientists watched as comet Shoemaker-Levy collided with Jupiter. It exploded in the Jovian atmosphere, and the Hubble telescope recorded the largest incandescent fireball ever witnessed rising over Jupiter's horizon.  Mark Boslough, who specialises in modelling large impacts on supercomputers, created a simulation of a similar impact on Earth.  The simulation revealed that an impactor could indeed generate a blistering atmospheric fireball, creating surface temperatures of 1,800C, and leaving behind a field of glass.  "What I want to emphasise is that it is hugely bigger in energy than the atomic tests," says Boslough. "Ten thousand times more powerful."  Read more: [link removed by eBay]  

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    Libyan desert glass

    Libyan desert glass

    Libyan desert glass  (LDG ), or great sand sea glass  is a substance found in areas in the Libyan Desert . Fragments of desert glass can be found over large areas, up to tens of kilometers .

    Contents
    • 1  Geologic origin
    • 2  See also
    • 3  References
    • 4  Literature
    • 5  External links

    Geologic origin Tutankhamun 's pectoral features a scarab  carved from desert glass.[1]

    The origin of the glass is a controversial issue for the scientific community, with many evolving theories. Meteoritic  origins for the glass were long suspected, and recent research linked the glass  to impact features, such as zircon -breakdown, vaporized quartz  and meteoritic metals, and to an impact crater .[2] [3] [4] [5] [6] [7] [8]  Some geologists associate the glass not with impact melt ejecta, but with radiative melting  from meteoric large aerial bursts . If that were the case, the glass would be analogous to trinitite , which is created from sand exposed to the thermal radiation  of a nuclear explosion . The Libyan desert glass has been dated as having formed about 26 million years ago. It was knapped  and used to make tools  during the Pleistocene .

    See also
    • Desert glass
    • Darwin glass
    • Edeowie glass
    • Lechatelierite
    • Impactite
    • Kebira Crater
    • Tektite
    • Tunguska event

    References
    1. Jump up  ^  Tut's gem hints at space impact , BBC News , July 19, 2006.
    2. Jump up  ^  Jan Kramers, David Block, Marco Andreoli (2013). "First ever evidence of a comet striking Earth" . Wits University.
    3. Jump up  ^  Kramers, J.D et al (2013): Unique chemistry of a diamond-bearing pebble from the Libyan Desert Glass strewnfield, SW Egypt: Evidence for a shocked comet fragment. Earth and Planetary Science Letters 382, 21-31
    4. Jump up  ^  B. Kleinmann (1968): The breakdown of zircon observed in the Libyan desert glass as evidence of its impact origin. Earth and Planetary Science Letters 5, 497-501.
    5. Jump up  ^  Weeks, R. (1984): Libyan Desert glass: A review. Journal of Non-Crystalline Solids, 67, 593-619.
    6. Jump up  ^  Seebaugh, W. R. & Strauss, A. M. (1984): Libyan Desert Glass: Remnants of an Impact Melt Sheet. LUNAR AND PLANETARY SCIENCE XV, 744-745. [Abstract.]
    7. Jump up  ^  Barbara Kleinmann, Peter Horn and Falko Langenhorst (2001): Evidence for shock metamorphism in sandstones from the Libyan Desert Glass strewn field. Meteoritics & Planetary Science 36, 1277-1282
    8. Jump up  ^  Giovanni Pratesi, Cecilia Viti, Curzio Cipriani and Marcello Mellini (2002): Silicate-silicate liquid immiscibility and graphite ribbons in Libyan desert glass. Geochimica et Cosmochimica Acta 66, 903-911.

    Literature
    • V. de Michele (ed.): Proceedings of the Silica '96 Meeting on Libyan Desert Glass and related desert events , Bologna, 1997Contents
    • P.A. Clayton / L.J. Spencer: Silica Glass from the Libyan Desert , Vortrag vom 09.11.1933 online

    External links
    • Google Scholar: "Desert Glass"
    • Saudi Aramco World : Desert Glass: An Enigma
    • Sahara Desert Glass/Tutankhamun's gem stone
    • Glass in Nature from The Corning Museum of Glas 
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    • FURTHER NOTES ON LIBYAN DESERT GLASS 
    • Libyan desert glass (LDG), or great sand sea glass is a substance found in areas in the Libyan Desert. Fragments of desert glass can be found over large areas, up to tens of kilometers. The origin of the glass is a controversial issue for the scientific community, with many evolving theories. Meteoritic origins for the glass were long suspected, and recent research linked the glass to impact features, such as zircon-breakdown, vaporized quartz and meteoritic metals, and to an impact crater.Some geologists associate the glass not with impact melt ejecta, but with radiative melting from meteoric large aerial bursts. If that were the case, the glass would be analogous to trinitite, which is created from sand exposed to the thermal radiation of a nuclear explosion. The Libyan desert glass has been dated as having formed about 26 million years ago. It was knapped and used to make tools during the Pleistocene.

      In 1996 in the Egyptian Museum in Cairo, Italian mineralogist Vincenzo de Michele spotted an unusual yellow-green gem in the middle of one of Tutankhamun's necklaces. The jewel was tested and found to be glass, but intriguingly it is older than the earliest Egyptian civilisation. Working with Egyptian geologist Aly Barakat, they traced its origins to unexplained chunks of glass found scattered in the sand in a remote region of the Sahara Desert. But the glass is itself a scientific enigma. How did it get to be there and who or what made it?

      Desert Glass - an Enigma In December 1932, an Egyptian Desert Survey expedition led by P. A. Clayton was sent southwest from Cairo to study the previously unexplored regions of the Egyptian Sand Sea, north of a broad plateau, the Gilf Kebir. On December 29 of that year, members of the expedition discovered, scattered about on the desert, transparent to translucent pieces of a pale yellow-green vitreous substance that has since become known as Libyan Desert glass.

      Located in the Great Erg, or Sand Sea, on the Egyptian-Libyan frontier, the area where the glass is found measures roughly 80 miles north and south by 30 miles east and west in the corridors between a series of dunes (saifs) that rise abruptly above sharply contrasting weathered debris that overlies bedrock of the Nubian Sandstone deposited during the Early Cretaceous Epoch some 100 million years ago.

      Although the glass was used for tools by Pleistocene man, and may have been discovered as early as 1846 by explorers, the inaccessibility of the region and the harshness of the terrain precluded any further investigation until Clayton went back in 1934 with L. J. Spencer, then Keeper of Minerals in the British Museum. And it was not until 1971, when a joint University of Texas-University of Libya team explored the western extremity of the area, that modern science had a look. Indeed, the terrain is so remote and inhospitable, that when the American-Libyan team neared the site of the glass deposits, they discovered an Egyptian plane, intact, with the remains of nine passengers scattered about, lying where they died of thirst several days after they landed, lost and out of fuel, more than three years earlier.

      The glass has generated intense interest among scientists because its origin remains an enigma. Was it produced by the encounter of an extraterrestrial body with earth? Science isn't sure and, in fact, has come up with at least 10 theories to explain its origin.

      Many researchers consider Libyan Desert glass to be a form of tektite (from the Greek tektos, meaning molten), a natural black, dark green, or dark brown glassy stone, resembling the volcanic glass obsidian, that may possibly be of extraterrestrial or meteoritic origin. Tektites, which occur in four large associations of distinctly different ages throughout the world known as strewn fields, are similar to Libyan Desert glass in that both substances are composed chiefly of silica (silicon dioxide); the silica content of tektites ranges from 68-80 percent whereas that of Libyan Desert glass is approximately 98 percent. Both tektites and Libyan Desert glass are characterized by etched, pitted surfaces, which in the case of some of the silica glass may have been obscured by the scouring action of the fierce Saharan winds.

      Tektites, first scientifically reported in 1788, have been the subject of investigation since that time. In 1844, for example, Charles Darwin, the great naturalist, described a specimen he was given in Australia while on the famous globe-circling voyage of H.M.S. Beagle from 1831-1836.

      Undoubtedly of natural origin, tektites have been interpreted by various investigators as: (1) ejecta from terrestrial volcanoes, (2) meteorites, (3) ejecta from lunar volcanoes, (4) glassy material produced by lightning striking the earth, (5) glassy material produced by lightning discharge into the dusty, hot gases of a volcano's eruptive cloud, (6) the product of desiccating siliceous gels, (7) glassy debris from a disrupted planetary body with a glassy surface layer, (8) material produced by forest fires, (9) glassy material produced by meteorite impact on earth, or (10) similar material resulting from meteorite impact on the moon. It was even argued by some, for a time, that tektites had been produced by human activities such as furnace operations or as a by-product in the manufacture of glass.

      The shape of tektites is varied; they may resemble buttons, teardrops, dumb-bells, rods, spheres, or disks. Some are blocky and layered. Although commonly about an inch in diameter, they range up to a maximum diameter of almost 12 inches and weigh as much as 28 pounds. Many tektites show the effects of surface etching and pitting - interpreted by most specialists as having developed through chemical action during burial on the earth's surface. Some tektites, especially those from Australia, show a distinctive surface sculpture almost certainly produced by aerodynamic ablation as the glassy object hurtled through the earth's atmosphere. It was this characteristic of some tektites that drew special attention to them as the pace of the U.S. space program to reach the moon quickened. Tektites provided a model for the design of heat shields with which to protect spacecraft returning to earth through the atmosphere. Suddenly these curious objects of heretofore relatively minor interest were center stage, because they had already journeyed through the earth's atmosphere, and many were readily available for study.

      The chemical composition of tektites is similar to that of crustal rocks of the earth, and the discovery in some tektites of rare minerals produced only by extremely high pressure has led many to believe that tektites are a form of glass, impactite, produced by meteorite impact. This view was further enhanced by the discovery in some tektites of small spheres (spherules) of nickel-iron, the material of which many meteorites are composed.

      Specialists were divided, however, on whether tektites were produced by impact on earth and were consequently splashed into their strewn fields, or whether the impact events occurred on the moon with some of the ejecta reaching lunar escape velocity and reaching earth as a form of meteorite. The hypothesis of lunar origin of tektites was dealt a severe blow by the failure of samples returned from the moon by the Apollo missions to contain any tektite-like material or plausible tektite parent material.

      Some large terrestrial impact craters have been identified as being of the correct age and location to be the parent craters for some of the tektite-strewn fields, but for some strewn fields no parent craters have thus far been identified. Based on aerodynamic arguments however, some investigators feel that tektites cannot have a terrestrial origin and be distributed as they are in strewn fields. They further maintain that tektites can only have come from certain lunar volcanoes that are believed to have erupted material at lunar escape velocity in the directions necessary to result in impact with the earth. And so the debate continues.

      Is Libyan Desert glass a tektite? Although it usually is discussed in the same context as tektites and is considered by some investigators to be a variety of tektite, there exist some very distinct differences. Libyan Desert glass has a uniformly higher silica content than tektites, and it shows no evidence of aerodynamic sculpturing. Many of the fragments are tabular and layered, which is characteristic of only one kind of tektite, the so-called Muong-Nong tektites of southeast Asia. Libyan Desert glass never occurs in such distinctive shapes as dumbbells, rods, spheres, disks, and teardrops as do tektites, and the color of the glass is rarely as dark as the color of typical tektites. In fact, some of the glass is quite colorless. It ranges in size from tiny flakes 0.01mm in diameter up to pieces the size of a person's head and weighing over 16 pounds. Both tektites and Libyan Desert glass are harder than the steel in a knife blade, but no harder than the mineral quartz. Fragments of Libyan Desert glass are somewhat lighter weight than tektites of equal size. Both tektites and Libyan Desert glass may contain bubbles; those in the glass tend either to be elliptical, indicating deformation of the bubble during flow, or elongated and pointed, suggesting deformation of original pore space in material that barely melted.

      Analyses of both major and trace elements of the glass and of the Nubian Sandstone upon which it rests, together with the stratification visible in numerous pieces, have revealed that the Nubian Sandstone is a suitable parent material for Libyan Desert glass and suggest that the glass could be of impact origin. What is not yet understood is the mechanism that produced, momentarily, heat intense enough to melt surface rock or weathered debris. For the quartz-rich Nubian Sandstone, the melting temperature would be about 2,800°F.

      Although nickel-iron spherules have not been identified in the glass, it is still possible that it was formed by the impact of a stony meteorite (or aerolite). There are, for instance, two small craters in the desert glass area, and although there is no evidence relating the craters to the glass, it would be an unusual coincidence to find such rare material as Libyan Desert glass so close to such relatively rare structures as astroblemes (deeply eroded impact features) without some relationship.

      Virgil Barnes has suggested that perhaps the glass was produced by the heat wave of a passing comet or by the intense heat generated by an exploding comet - neither of which would necessarily disrupt the surface rocks. Afterwards, the molten silica glass may have flowed into low areas, puddled and cooled - thus forming Libyan Desert glass. Later, it may have been broken up by weathering and then moved, either by running water, in an earlier, wetter climatic period, or by humans in prehistoric times.

      On the other hand, most Libyan Desert glass is much more dense and homogeneous than the well described porous and impure "impact" glass (impactite) found in such craters as Henbury in central Australia, Wabar in the Rub'al-Khali of Saudi Arabia, or 4 the nuclear test craters in Nevada.

      The absence of an extremely large impact crater in the vicinity of the Libya Desert glass, moreover, is not highly relevant. The glass has been reliably dated (by fission-track methods), as 28.5 million years old. That’s so long ago that any impact crater may have been covered by shifting sands or erased by erosion. Opponents of the cometary or meteoritic origin of Libyan Desert glass say it is highly improbable that such large, homogeneous pieces of glass could be formed and freed of volatiles within the earth's atmosphere by any process of simple fusion of sand, while supporters contend that the chemical composition of Libyan Desert glass so closely resembles the Nubian Sandstone - upon which it rests -that the probability of finding two so similar yet unrelated materials together is extremely remote.

      Obviously, the origin of Libyan Desert glass is unresolved and remains a topic of intense discussion among tektite specialists. But most scientists do agree that ancient man used the glass at a time when the Sahara's climate was quite different.

      For nearly 10,000 years, the Sahara, of which the Great Erg or Sand Sea is a part, has been a hot, forbidding land, unattractive in most regions to human habitation.

      But 50,000 years ago, what is today the Sand Sea may have closely resembled the Mediterranean environment of modern Greece and was thus more habitable. As a result, in the latter phase of the Palaeolithic (or Old Stone Age) there appeared the Aterian culture, named after an archaeological site in eastern Algeria.

      Appearing about 30,000 years ago and persisting until perhaps 18,000 years ago, the Aterian people were apparently the first to recognize Libyan Desert glass and make use of its special properties. Like many types of glass, that from the Libyan Desert flakes conchoidally. That is, by striking the material a glancing blow with another rock, or baton of wood or bone, flakes may be removed in a predictable fashion so as to produce a variety of efficient cutting edges. The Aterian people used this property of Libyan Desert glass to their advantage and produced an array of skillfully-flaked implements (See page 4, top). After their expeditions in the 1930's, Clayton and Spencer said that at least 10 percent of the Libyan Desert glass flakes recovered exhibited some sign of human workmanship and Virgil Barnes and James Underwood, who visited the Libyan Desert glass strewn field in 1971, reported that the largest specimen collected during their expedition - a tabular cobble weighing nearly two pounds - shows percussion marks that suggest the piece may have been used as a pounding tool. Flakes of Libyan Desert glass have also been found in localized concentrations suggesting the manufacture of implements on the spot. Other fragments of the glass have been located some 140 miles from the known field - and in a few instances on the top of the saif dunes, suggesting transport by man.

      On the basis of the above evidence it is logical to conclude that by Aterian times, Libyan Desert glass was used for the manufacture of lithic tools. But there is still an enigma: although Libyan Desert glass has been dated as 28.5 million years old, there is no evidence that man used it before Aterian times even though much older Nubian Sandstone handaxes have been found.

      One plausible solution to this problem, offered by Virgil Barnes, is that the area that is now the Sand Sea may have been covered by thick deposits of sand prior to the climatic perturbation of the late Pleistocene age that could have whipped the sand up into saif dunes, thus exposing the Libyan Desert glass below.

      On the other hand, the highly polished and faceted surface of many of the exposed Libyan Desert glass fragments indicates that some of them have been exposed to the abrasive actions of wind and sand for a good deal longer than 30,000 years. As Kenneth Oakley has pointed out in Nature,"... it is important to bear in mind that the glass was already corroded by sand-blast before it was worked into the [Aterian] bifaced points."

      Naturally, it is possible that the Libyan Desert glass lay on the surface for some 26 million years or so before the arrival of humans on the scene and was then covered for a short period up to about 30,000 years ago when the Aterian people began to utilize the material. Nevertheless, it remains an important task for archeologists working in this region to investigate the possibility of pre-Aterian occurrences of Libyan Desert glass artifacts.

      Since the time of the Aterian's utilization of the substance, humans have found no practical use for Libyan Desert glass. From a scientific viewpoint, however, its existence continues to provoke intense curiosity regarding the formation of such unique material. Fundamental questions relating to the nature of Libyan Desert glass have yet to be adequately resolved. Can it be considered a true tektite? How did Libyan Desert glass come to be formed in such large, relatively homogeneous masses? Why the striking similarity between the silica glass and the Nubian Sandstone upon which it rests? Coincidence? Perhaps; perhaps not. One hopes that continued diligent research will provide us with answers to these questions and perhaps shed light upon the origin of other tektites as well. Sky of fire An Austrian astrochemist Christian Koeberl had established that the glass had been formed at a temperature so hot that there could be only one known cause: a meteorite impacting with Earth. And yet there were no signs of an impact crater, even in satellite images. American geophysicist John Wasson is another scientist interested in the origins of the glass. He suggested a solution that came directly from the forests of Siberia. "When the thought came to me that it required a hot sky, I thought immediately of the Tunguska event," he tells Horizon. In 1908, a massive explosion flattened 80 million trees in Tunguska, Siberia. Although there was no sign of a meteorite impact, scientists now think an extraterrestrial object of some kind must have exploded above Tunguska. Wasson wondered if a similar aerial burst could have produced enough heat to turn the ground to glass in the Egyptian desert. Jupiter clue The first atomic bomb detonation, at the Trinity site in New Mexico in 1945, created a thin layer of glass on the sand. But the area of glass in the Egyptian desert is vastly bigger. Whatever happened in Egypt must have been much more powerful than an atomic bomb. A natural airburst of that magnitude was unheard of until, in 1994, scientists watched as comet Shoemaker-Levy collided with Jupiter. It exploded in the Jovian atmosphere, and the Hubble telescope recorded the largest incandescent fireball ever witnessed rising over Jupiter's horizon. Mark Boslough, who specialises in modelling large impacts on supercomputers, created a simulation of a similar impact on Earth. The simulation revealed that an impactor could indeed generate a blistering atmospheric fireball, creating surface temperatures of 1,800C, and leaving behind a field of glass. "What I want to emphasise is that it is hugely bigger in energy than the atomic tests," says Boslough. "Ten thousand times more powerful."

      Defence lessons The more fragile the incoming object, the more likely these airborne explosions are to happen. In Southeast Asia, John Wasson has unearthed the remains of an event 800,000 years ago that was even more powerful and damaging than the one in the Egyptian desert; one which produced multiple fireballs and left glass over three hundred thousand square miles, with no sign of a crater. "Within this region, certainly all of the humans would have been killed. There would be no hope for anything to survive," he says. Barakat holds up one of the many, huge chunks of glass in the desert According to Boslough and Wasson, events similar to Tunguska could happen as frequently as every 100 years, and the effect of even a small airburst would be comparable to many Hiroshima bombs. Attempting to blow up an incoming asteroid, Hollywood style, could well make things worse by increasing the number of devastating airbursts. "There are hundreds of times more of these smaller asteroids than there are the big ones the astronomers track," says Mark Boslough. "There will be another impact on the earth. It's just a matter of when."

      Dark streaks in some specimens of LDG

      Dark streaks and different types of inclusions in Libyan Desert Glass (LDG) collected from the LDG strewn field in Egypt were investigated. Rare transparent spherules enclosed in the glassy matrix are characterized by concentric cracks, irregular internal cracks, intense twinning, and considerable amounts of Ti and Al. Raman spectra show that the spherules are α-cristobalite. Their occurrence together with lechatelierite indicates quick heating of the source rock to at least 1550 °C, followed by rapid quenching leading to crystallization of β-cristobalite, which upon cooling inverted into α-cristobalite. Brownish inclusions are irregularly shaped, elongated objects with smooth contacts to the surrounding glass. They contain small roundish to elliptical droplets, and a few larger angular grains, which compositionally and according to their Raman spectra most closely resemble low-Ca, Al-rich orthopyroxene. Composition and texture of the orthopyroxene suggest that the brownish inclusions formed by incomplete melting of an Al-rich orthopyroxene bearing precursor, e.g., mafic phases present in desert surface sands or also of orthopyroxene-bearing granulite dykes in the LDG target. Experimental data on Ca-poor enstatite also support that the inclusions were heated to about 1550 °C. Analyses of dark streaks in LDG reveal high abundances of Al, Ti, Mn, Cr, Fe, and Ni and a pronounced correlation between the abundances of Cr, Mn, Fe, and Ni. As the Fe/Ni, Mn/Ni, and Cr/Ni ratios are all clearly nonchondritic, the source of this material is most likely terrestrial and the dark streaks studied here represent a different type of schlieren compared to those which contain a meteoritic component. These findings suggest LDG formation during a short high-temperature event. Melting of Al-rich orthopyroxene bearing target material seems to suggest an asteroid impact rather than a near-surface airburst.

      Brownish Inclusions

      Brownish inclusions are irregularly shaped, elongated objects that exhibit smooth contacts to the surrounding glass, with schlieren extending from the inclusions into the glass matrix . Optical microscopy reveals that the inclusions are composed of numerous sub-μm to about 2 μm sized bubbles causing the brownish color and of subrounded to rounded mineral grains displaying higher refractive indices than the surrounding glass While some of these phases appear as small roundish to elliptical droplets , a few larger and more angular grains exist . Generally, all phases within the inclusions appear isotropic when viewed under cross polarized light; however, two of the larger grains are birefringent . In BSE imaging a pronounced contrast due to different compositions of the phases inside of the inclusions and their glassy groundmass is apparent . Tiny sub-μm to a few μm sized droplets/ellipsoids are very abundant and occur scattered throughout the inclusions; only regions very close to larger droplets and angular grains appear free of them . Rounded and elongated grains vary from approximately 10 to 70 μm in size and often show a shape-preferred orientation with alignment parallel to the longest axes of the respective inclusions (Fig. 4). Large grains are up to 250 μm in size and also aligned parallel to the inclusions’ longest dimensions. Angular grains frequently contain glassy inclusions (which themselves contain sub-μm droplets) and display strongly embayed outlines. One grain shows quite straight edges . Whilst the vast majority of the different particles display smooth surfaces, the two birefringent grains exhibit a distinct porous, “sponge-like” structure

  • Condition: New
  • Country/Region of Manufacture: Libyan Arab Jamahiriya
  • Libyan Desert Glass LDG: Tektite Impactite Glass Meteorite

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