Post subject: Re: Anyone know this stone or crystal
Posted: Thu Sep 30, 2021 2:21 pm
Site Admin
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
I believe a few additional tests are in order. Can you scratch it with a pen knife, hardness 5.5; a real COPPER penny, hardness 3.5; fingernail, hardness 2.5? Take care of that thumb nail. We don't want to see any more mishaps.
It you put a couple drops of vinegar on it, does it fizz?
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