this post was submitted on 13 Jan 2026
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Cool Rocks

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A place for:

Minerals are cool, too.

Be gneiss to each other.

Please use posts for your rocks. Feel free to add more pictures and links to articles in the post text.

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Unknown rock I found (lemmy.nz)
submitted 6 months ago by WhyIHateTheInternet@lemmy.world to c/cool_rocks@lemmy.today
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Don't remember where I found it but it's cool!

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[–] Sarcasmo@piefed.social 14 points 6 months ago

Chrysocolla.

[–] starik@lemmy.zip 9 points 6 months ago

Copper ore?

[–] Asafum@lemmy.world 7 points 6 months ago (1 children)

I love copper bearing minerals! They make some of my favorite colored minerals!

Dioptase:

Azurite:

Good ol Malachite:

The first thing I thought of when seeing yours was chrysocolla but I'm not totally convinced.

[–] Ashiette@lemmy.world 2 points 6 months ago

Could be malachite

[–] faizalr@piefed.social 6 points 6 months ago

Very cool.

[–] Endymion_Mallorn@kbin.melroy.org 5 points 6 months ago (1 children)

Is it magnetic? Radioactive? Fluorescent?

[–] Cuzscience@lemmy.world 8 points 6 months ago* (last edited 6 months ago) (1 children)

I had a mineralogy professor that was notorious for giving lab practicals that would consist of wonky specimens of similar/exact same colors. So ID from physical appearance was not a good option. You had to rely on all the other properties for identification.

[–] Endymion_Mallorn@kbin.melroy.org 3 points 6 months ago

Yeah, it's always best to examine a sample in all the ways you can. Especially radioactivity.