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My dark trans measured a hair above 2.8. I want to go recheck it, because I don't have any other stones that measured that high, but the shape of it was regular (so it's a simple matter of measuring...

They are gray translucent stones. Call them black translucents is just something that the seller does, I guess because his mining rights include some very dark gray translucents, but they are much...

Any chert is a potential hone. That's a saying that an engraver told me. there's a huge difference between finding something you can use as a final finisher vs. something you could sell in volume.
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