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Here's a pic of some of my DBs. They're porous, the water you put on the stone gets sucked in. It really shows the difference between wet and dry. I don't think they match with yours.

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Hmm this one and 2 others I had were all just as hard as the other darkgreen LIs. So perhaps it is something else or a LI that just happens to be softer.

DBs are sandstones and their wavepatterns, if they have one, are more erratic. Especially since you describe it as glassy I would think it's a LI. Here's mine, you can have a look and see if it...