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A bit off topic; Unlike what I used to think of, novaculite isn't just translucent/non porous Arkansas.
It has many forms, the way it flakes can be different, and these flakes themselves can be...

Needless to say, I meant no offense. If the stone is a fine one you can shave comfortably with, that's all you need, the name is irrelevant.
Also, the back side with the natural appearance look...

Chances are, it's not a Thuringian. All we know is, it's dark, and a slate. Also, it has some different coloration that is not characteristic of a Thuringian, that's a fact.
Earth has plenty of...