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Well quartz is an abrasive, typical for a lot of whetstones i.e. thuringians and novaculite stones - for example Arkansas. In Coticules quartz is not the main abrasive but garnets (spessartine...

Hello Mikhail,

the coticule looks like it is a Les Latneuse vein. The interesting thing is that most Les Latneuses are combinations of two layers, one is a more coticule like layer in typical...