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Coprolite Hardness


Gravel Monkey

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Gravel Monkey

I was recently given some coprolite to polish for a friend.  I was wondering if anyone knows what the general hardness would be as it relates to Mohs scale.

 

Thank you

 

Coprolite Slices For Polishing.jpg

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That would all depend on what mineral(s) they were replaced with.

 

Your question is basically like asking "how hard is this rock?"  without knowing what the rock is.

Can you give some information as to what the coprolite may have belonged to and or where it was found? This may give some idea as to what minerals are in the area.

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Gravel Monkey

I will have to contact the owner to determine where he got it.  From the difficulty in grinding out some of the saw marks, I'm guessing that it is in the 7 range.  

Thank you

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I'm guessing the hardness would match that of jasper. This material is pretty common. It is most likely from Utah (Morrison Formation). While many people call this coprolite, it probably does not have fecal origins. 

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