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After more research and some lucky talks I believe this to be epidote from tailings out of the Wolverine Mine, a few miles from where I found these pieces.
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Was rock hounding on the southern shore of Lake Superior. Found these green crystal deposits that formed like geodes, specimens are small, the largest is about the size of a corn kernel. A local said it could be chlorasolite but I don’t think it matches based on color and clarity. Any thoughts would be appreciated!
This honestly just looks like regular old peridotite in some sort of basaltic groundmass. The crystals would be made of olivine which is very green and the surrounding groundmass I’m not sure, something mafic to ultrmafic though.
I have no idea what that is, but it looks beautiful. You should have someone point an XRF gun at it to get a reading of what it’s made of. What if it’s some spicy compound of Cd, Ni or As.
You could narrow it down with webmineral or mindat, but you might still be left with hundreds of options.
I’ll check out those resources, thank you! I thought arsenic as well as I know they used to make green dyes from it. Guess I’ll skip the taste-test for now haha
People generally think rocks are pretty harmless, but they really shouldn’t.
Once you know the basics of geology or mineralogy you can look up the metal composition of most of the rocks you find in your environment. After that, there’s no turning back. You’ll never want to lick another random rock again, and you’ll be more cautions about breathing in rock dust.
My gut says chrome diopside, or something in that solid solution. But more than a photo would be required.
