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The more you can report about them (where it was found, what was done to it, whether it attracts a magnet, and more) the better chance you'll have getting an answer.

 

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On 10/10/2020 at 11:20 AM, GB_Amateur said:

The more you can report about them (where it was found, what was done to it, whether it attracts a magnet, and more) the better chance you'll have getting an answer.

 

I don’t know, looks like a big piece of coprolite to me..  just kidding! all of the above plus streak test it on unglazed porcelain or the backside of a toilet tank. If its reddish brown streak, its probably hematite (Iron oxide).

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I agree, Magnetite or Hematite. Check to see if magnetic, more so if Magnetite.  

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