Is this a bone or a mineral rock??

[treasure777]

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[treasure777]

it doesn't change darker in water it stays the same color

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[HuntinDog]

It looks a lot like Quartz rock from where I sit.

 

[Audozer]

Looks like quartz to me too

 

[diggummup]

Quartz is a likely suspect but Calcite is a possibility also.