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Valchion

I have found this coiled cephlapod in Pennsylvanian age limestone in Missouri.  I believe it to either be a temnocheilus or cooperoceras.  I was wondering if there is anyway to tell if this fossil was silica.  And if it was could it be prepped by using acetic acid. TIA!

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JohnBrian

Put a tiny drop on the fossil & see if it fizzes. If it does, wash it off quickly in water. Don't know if it would be a good idea to process the fossil (assuming it's NOT reactive) with acid. But someone with much more experience will be along to tell you what to do!

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Ptychodus04

@JohnBrian has the right idea.

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Mark Kmiecik

I can't tell how large the specimen is from the cropped photos, but if there's more fossils preserved in the same way you could try the acid on one or more of them first.

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