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I invite you all later to discuss the findings here as open minded as possible.....i like every input from the community, even if there will be different views and interpretation...

Mhh..actually what are abrasives should be the easy task, as far as i understood its not too difficult. Used is a petrographic microscope with polarized lights which is used for mineral...

I expect the following results:

1. proper/correct geological identification of the type of stone
2. more details on particle sizes and form of abrasives
3. amounts of abrasive mineral content...

Actually the samples i sent were only Naguras i do not known the origin of,
on the other hand i think we mostly talk about sedimentry stones when it comes to Jnats.

haha :-) Ok thanks for your Input :bow

I wanted to report another Update for my researches. As many of you might now iam still in the search of the fine french razor hones beeing sold under the "La Lune" and "Special Stone only for Good...