RFACo. ~ Rosetta Premium-Fine Grade ~ 970g ** Natural Whetstone/Sharpening Stone
Highly microporous surface approaching a glazed ceramic in texture.
An ultra-hard, durable, super fine stone made from an excellent, tightly grained natural source mineral.
Slow cutting, micro-porous polishing stone. High density hone to create an optimum profile to stainless steel edges.
A burnishing hone suited to final finishing and polishing of best quality straight razors.
~ Microporous silica containing trace amounts of sericite ~
~ Rosetta Premium-Fine Grade gives optimum finishes to surgical grade steel alloys ~
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- Use water/soap lather or nagura type slurry stones to keep the porous surface clear of sharpening swarf -
- Alternatively, the hone may be given dressing and kept as an oil stone -
- Full lapping one side - See listing images -
~ For light cleaning of the surface: 600 grit silicon carbide paper sheet cost inclusive ~
~ For any routine flattening of the surface, silicon carbide dressing stones are preferred ~
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Rosetta sharpening stones qualify into five types:
Premium-Fine Grade :
Very fine, final finishing variety & uniquely clear, hard grain of stone.
Slow cutting stone used in final finishing.
Note on Premium-Fine Grade : Extremel y tight grain of stone.
For optimum finishing, use on soft to medium temper steel alloys.
~ Note : Rosetta Matrix are recommended f or ver y hard tempers . ~
Superior-Fine Grade :
Similarly, a very fine finishing type, equally as hard and durable, yet of slightly less tightness to the grain.
Regular-Fine Grade :
Excellent for procession honing, cuts quickly with a specific ease to control.
The grain is more open, has somewhat less density.
Provides stainless alloys with brilliant finishing polish.
Course Grade :
A gritty type of micro-quartz mineral, quite porous & fast cutting.
For resurfacing &/or removing small damages to the edge, initializing bevels, &c.
Matrix :
A top grade finishing hone when sharpening harder temper alloys &/or high carbide steel.
Uniquely suitable for achieving bright polishing & surgical grade finishes to hard temper steel.
Ultra hard, tight clay matrix variety. Slower cutting, microporous stone.
Hard, dense and fine ~ Sedimentar y Matrix T ype ~ Finishing hone ~
~ See our in store listings for a selection of clay matrix water hones ~ _______________________________________________________________________________________ _______________________________________________________________________________________
~ Attention Canadian Customers; For combined shipping, inquire for Canada Post Flat Rate Box; up to 5 kg for $20 CAD
~ All inquiries welcome ~ RFACo. Notes on Natural Sharpening Stones. A 'pure' sample of novaculite would contain SiO2 or molecular silica only. Our 'Invitica' listings are from this type of geological formation. Sedimentary or clay matrix novaculite often have 2/3 SiO2 [silicon dioxide] content. Generally speaking, this is the microporous form of quartzite doing the sharpening. The other 1/3 is a bonding mineral often known as either Musk ovite or as Sericite.". The 'Persia' hones as fine examples of these sharpening stones. Black veins occurring in certain hones exhibit iron oxide concentrations in the Muskovite. In others, bluish patches demonstrate other mineralizations within the clay matrix stones. Iron oxide is normally present. Certain matrix stones have higher, more visible concentrations [In Japan, this characteristic is known as renge]. Examples of our “Lochinvar” sharpening stones demonstrate this ‘Iron Renge’ as an orange feathering or what specific examples surface as a pattern of glowing metallic sheen. “Rosetta” ‘Premium-Fine', 'Superior-Fine', 'Regular-Fine', & 'Select’ stones have been exposed to very high temperature volcanic or geothermal activities, thus giving them giving them an extraordinary hardness. This aspect demonstrates both the level of geothermic activity that had once taken place and the actual qualities of their mineral sediment. Often, natural hones are praised because the actual particle fineness is superior to that of man-made and synthetic stone. Also, the natural particles break away while honing, in turn leading to both longer lasting and more durable edges. Also, the mineralogy of individual deposits lead to a greater range of specifics. Such honing creates subtle, distinguishing results, some are more 'crisp', some more 'feathered', certain stones finish well again with the steel of a certain temper, and so on. Lastly, it is within professional establishment that natural stones do, in fact, harden the edge. Sharpening-grade novaculite normally produces a range of textures. These range from those with the appearance of an unglazed porcelain, a porosity of several percent and serves as a good stone for coarse sharpening, to an extremely fine-grained material known for having almost no porosity and as an excellent tool for honing a razor-sharp blade.