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the scratch you made on the stone if your finger nail wont catch on it then its safe to say its a surgical black ark

it very well could be an black ark, i just didnt like the crack going down the middle but the crack looks like it formed with the stone. when you scratch the stone rubbing your finger nail over the...

taking a closer look at the last pic are those cracks running down the middle of the stone ? try the scratch test use the side of the stone take a nail or a knife and scratch the stone what color is...

surgical black ark size is a little off but the gray slurry sounds right super hard stone i would like to see a better pic of the striations and do you have a c-12k ? if so compare the two's slurry...