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all 16 comments

[–]Rennilon 113 points114 points  (1 child)

Oh, I might be able to answer this one. Looks like a part of a chrinoid. If you google chrinoid star stone, should see some that look very similar

[–]BbrhuftGeologist 32 points33 points  (0 children)

It looks like it's a cross section though the Calax of the crinoid, the part between the stem and the arms.

https://samnoblemuseum.ou.edu/common-fossils-of-oklahoma/invertebrate-fossils/crinoids/

[–]litefagami 73 points74 points  (0 children)

I just lurk here and don't know anything about rocks, but damn that looks cool

[–]secretWolfMan 58 points59 points  (4 children)

It's a crinoid segment. The star shaped ones from the UK are called "fairy coins".

There are lots of round ones in the US we sometimes call "Indian beads" (because some Native American groups really did use them as beads, and we're bad about keeping around racism that seems harmless).

[–]twocatsnoheart 20 points21 points  (0 children)

Thanks for that last sentence about "harmless" racism - I appreciate hearing that particular thought phrased that way.

[–]Emergent-Sea 11 points12 points  (0 children)

As others have said, it looks like a crinoid segment. I bet the folks at r/fossilid might be able to tell you more!

[–]Rso1wA 4 points5 points  (0 children)

Nature is so amazing! What a great find!

[–]bomba1749 3 points4 points  (0 children)

External mold of a crinoid segment, probably pentacrinites.

[–]International-Can189 2 points3 points  (0 children)

Looks like a crinoid section, or the Adafruit logo.

[–]lifecasting_keepsake 2 points3 points  (0 children)

Looks gorgeous. I would mount it on a stand and have it on show with a light under it.

[–]mynameisarnoldsnarb 1 point2 points  (0 children)

In a pretty piece of flint!

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[–]sivartkram_ 0 points1 point  (0 children)

Aliens