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Is this "Serpentine"? Found in obsidian flow

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Found a pretty large roadside obsidian flow here in Oregon. Large, 30 foot hills of glassy black to black with brown and green to glassy brighter green. I sanded two sides of this smaller piece and did not get what I expected.

It was a piece from the same flow as all these much larger pieces.


asked Sep 21, 2015 by Dave Sunhammer (120 points)

1 Answer

0 votes
This specimen certainly looks like serpentine.
answered Sep 21, 2015 by Weasel (58,940 points)
Does it have a smooth, greasy feel to it? That would be a characteristic identifies of serpentine.

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