Your guess is as good as mine...

kralcms

kralcms

Tenderfoot
May 25, 2013
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kralcms said:
Anyone have any ideas on what this is?
Click to expand...

It's a siderite nodule ( iron carbonate nodule) FeCO3. I find these all over. You can find some that have formed around fossils. I have found a really nice siderite nodule with a pyritized Branchiopod inside.
 

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Nj opals

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some sort of crystal... silicon from meteorite?

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