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Chamfer

Probable geologic from chalk formation

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Chamfer

This little specimen is just 5 mm tall, and 8 mm at its widest.

This comes from a chunk of matrix that I picked up in the chalk deposits in the area of Demopolis, Alabama. Having found an enchodus fish tooth in similar material, I'm making an effort to break up and look through this stuff a bit better before throwing it away.

This particular tiny thing was left behind in after leaving some pieces overnight in a white vinegar bath. The chalk dissolved away, leaving this.

Note the fibers scattered around it - those have come from the specimen.

 

I'm 90% sure this is simply geologic, not fossil. Even so, I'm curious if anyone can point me to how this might have formed.

 

unknown_8369.jpg

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TqB

It looks like a piece of Inoceramus shell.

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Raggedy Man

Looks like gypsum to me and would explain why it didn't dissolve in the vinegar solution. Gypsum is a hydrous calcium sulfate and does not react with vinegar.

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Coco

Hi,

 

That also seems to me to be some gypsum.

 

Coco

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Ludwigia

+1 more for gypsum.

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Chamfer

Gypsum it is, then. Thanks everyone. 

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TqB

I didn't read the post properly and missed the acid bit - gypsum it is.:blush:

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ynot

This form of gypsum is often called "satin spar" and is fairly common.

 

Tony

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