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Showing results for tags 'crystalline'.
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What crystalline mineral is this echinoid test made of?
TylerD posted a topic in Questions & Answers
I found this Coenholectypus echinoid in the Mainstreet Limestone in Fort Worth, Texas. Unlike the heart-shaped echinoid that I've found in other formations, these type echinoids' tests appear to have fossilized into a dark crystalline mineral. I'm not quite sure what mineral this is, and hope that it doesn't react to acids so that it can be acid prepped. It can be hard to see in the image, but on the edge of the fractured test you can see that it's made of a dark mineral with a reflective shimmer. I'm not sure if it is just calcite with impurities to make it that color, but of the 5 specimens of this genus, the 3 that are also crystalline have the same coloration.- 2 replies
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The bite mark(lol I know it’s not a bitemark) is an inch long and ONLY that part has crystalline chips in it. Any help would be appreciated.
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New detail of internal structure of trilobite eyes and implications of their location on the tree of life. https://www.nature.com/articles/s41467-019-10459-8
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I recently bought a smallish "fossil kit" online. Just some fossils in a bag from an outfit in West Virginia. I figured there would be a lot of steinkerns & bad preservation. I wasn't wrong in that. Lots of gastropod steinkerns, mangled urchins & urchin spines & star shaped crinoid stem sections. And some shells that seem sort of crystallized that light shines through. 2 reg pics of one of the better ones + 2 pics of light shining through. Pic #5 is an edge view of one of the broken ones & #6 is what I think may be beekite, which is present on several of them. Not really concerned with shell id for the most part, more curious as to what replaced the shells to make them semi transparent like this. Almost crystallized or agatized.
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