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Can someone ID this please- Thanks :)

0 votes

asked Nov 8, 2018 by RockSteady (120 points)

4 Answers

0 votes
Obsidian maybe, where did you find it. Like Reno, Nevada in a dry riverbed.
answered Nov 11, 2018 by Weasel (58,940 points)
0 votes
To me, the fractures do not look like obsidian. Is it magnetic?
answered Nov 13, 2018 by linkisnotzelda (5,390 points)
0 votes
This specimen has crystal faces therefore it cannot be obsidian, which is amorphous. The luster, form, and cleavage from the photo indicate a mica, most likely in the biotite family. Can you peel off layers or put a knife blade inside it?
answered Jun 6, 2019 by hershel (52,800 points)
0 votes
Looks like some sort of Biotite Mica.  Either way it’s a nice find :))
answered Jun 9, 2019 by anonymous

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