. Can use some help to identify the rock I found. It's black on the outside and white or gray on the inside.
closed as off-topic by hichris123♦ Jul 16 at 23:55
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- "Please review our rock identification guidelines to provide the missing information so that your question is both answerable and useful to new users." – hichris123
I have found stones like this before from the Owyhee Desert in southwestern Idaho. Your rock appears to be quartzite with a black coating similar to desert varnish which typically consists of iron and manganese oxides.