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yes mine looks the same way , graphite like layers, with very fine shiney flakes .It is a some kind of a mudstone , works realy well .
the only problem ,is that is soft and it digs it self quickly ,...

It could be a completely nonclassified stone . In one mountain walk , i found a slate stone , very homogenous and fine . It was very soft and fine , so i decide to give it a try . Now , after lapping...