what is this?, green rock from Wyoming yard sale |
Colorado Prospector - Gem and mineral prospecting and mining forums > Prospecting, Mineral Collecting and Treasure Hunting Forums > Prospectors and Rockhounding Field Work  |
what is this?, green rock from Wyoming yard sale |
 Nov 6 2016, 09:11 PM
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#1
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Observer  Group: Members Posts: 1 Joined: 6-November 16 Member No.: 123,619  |
I got this rock and have been trying to figure out what it is, was told it has sat around a long time, it has been sawed on at one time.
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Nov 6 2016, 11:54 PM
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#2
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Diggin' In! Group: Members Posts: 43 Joined: 28-July 14 From: Evergreen Member No.: 117,968 |
malachite
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Nov 7 2016, 10:45 AM
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#3
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 Diggin' In! Group: Members Posts: 10 Joined: 5-June 16 From: Ouray Member No.: 122,683 |
To me, looking at your second picture from the top, (rough uncut outside). It looks like a type of sedimentary breccia with slightly banded cauliform quartz as the matrix. I do see some light blue and green hues of color possibly indicating copper, which would be malachite and azurite most likely. It does not appear to one mineral but def a rock :). Interesting specimen. A picture of the stone wet and in the sunlight would help bring out the true colors and textures. You could try using your pocket knife to scratch the matrix (the material between rock fragments), if your knife does not scratch it and the rock actually scratches your knife, or leaves a silver/steel streak on the stone, that would tell you its mostly quartz.
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