Unitedstatesofamerica1 Posted January 18, 2018 Share Posted January 18, 2018 Quote Link to comment Share on other sites More sharing options...
d_day Posted January 18, 2018 Share Posted January 18, 2018 I'm thinking basalt or black dacite. Tough to tell with only a photo. You have streak, hardness, and specific gravity info? Quote Link to comment Share on other sites More sharing options...
bigrex Posted January 18, 2018 Share Posted January 18, 2018 Looks like some type of rock covered by desert varnish. There is a good chance it is not the same color inside. Quote Link to comment Share on other sites More sharing options...
Hoser John Posted January 18, 2018 Share Posted January 18, 2018 Hardness test mandatory as could be black jade ?John Quote Link to comment Share on other sites More sharing options...
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