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Of course there will be no naming names, who want to be caught a stone licker!

Anyone got an educated guess about the black rock in my pics?

G/Y Escher and one of the unknown black rocks;

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It's never right to take advantage of a rock!
Tho i licked one accidentally once.

Or just Mr T, to be on the safe side?

I've got a few "black rocks" I never got around playing with, that's why I looking for the "definite test", if there is one.
Tried one of them quickly and it...

One more thing I've noticed with different stones is that some stones give you a slurry that will dry you skin out.
I don't know why but it sure can be used to distinguish some rock from others....

I want to know, I wont promise I'll try on my Thuris but it wont hurt to know a test

...or you send it to me!

And try take some close up pics of it wet/dry and with slurry as you are using it!