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Spot on. All natural hones are not the same.
The garnets in Coticule are harder than quartz
by a lot. However in the '60 they were rare stones
so rumors began, which was my point.

Natural...

Stainless steel is interesting stuff. It does
not machine and grind the same as normal steel.
A machinist once remarked that he put a tiny back bevel
on the cutting edge tool steel because...