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2,234 questions

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rock with greenish blue spots

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need help identifying this one. It is a brown rock with greenish blue on it. Came in a baggie with some turquoise I bought at a yard salealt text, but wasn't sure if that is correct. Please help if you can.

asked Mar 5, 2014 by rosiefraz (1,560 points)

7 Answers

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Hard to tell - but definitely looks like a secondary copper mineral. See if you can post a large, more zoomed-in picture.

answered Mar 5, 2014 by hershel (52,700 points)
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alt text this one is closer. Will also add one of another side

answered Mar 5, 2014 by rosiefraz (1,560 points)
0 votes

alt text

answered Mar 5, 2014 by rosiefraz (1,560 points)
0 votes


I'm wandering about the blue color; is it like azurite blue? Or more like a turquoise?

I think I even see some green.

Just maybe (and I say maybe) a rough azurite malachite?

answered Mar 25, 2014 by Renata (7,840 points)
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its more of a turquoise color than blue

answered Mar 26, 2014 by rosiefraz (1,560 points)
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Wrong green blue for copper

answered Sep 1, 2014 by Weasel (58,810 points)
0 votes
Hello, I have a very similar looking stone and came across your post while trying to identify mine.

I am not 100%, but I believe it to be the host rock that the turquoise formed on, looks to be maybe like a metallic pyrite?  Here's the article I used that got me there : https://tskies.com/grading-turquoise-matrix-what-turquoise-patterns-are-made-of/

And a similar rock on Etsy: https://www.etsy.com/listing/225274666/large-natural-blue-turquoise-slab-pyrite?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=pyrite slab&ref=sr_gallery-1-4
answered May 6, 2018 by Tara