A friend gifted me a bag of rocks, these are some of my favorites. I'll tumble them after my current batch is done in a couple weeks.
this post was submitted on 14 May 2026
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Cool Rocks
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Minerals are cool, too.
Be gneiss to each other.
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That's what I thought at first, but they don't floresce under UV. I think they might be green calcite.
Check cleavage. Fluorite has octahedral cleavage, while calcite has 3 cleavage planes (one orthogonal to the other two, and the others forming a rhombus, IIRC)
In looking up how to tell, I found this site helpful for someone with only a basic understanding of rocks and minerals.
https://www.geologyin.com/2014/03/cleavage-of-minerals.html
The lines look more straightish than diamondish to me, especially in that lower right one which is kinda rhomboid, so I think calcite. Good tip!