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I need to identify rocks and gems for sale

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asked Jul 15, 2016 by Luis Peña (120 points)

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Post individual pictures with a short explanation about where you found and what you know about it. For example, I found this rock in a dry riverbed near Flagstaff, Arizona, it is black, it is not magnetic, I cannot scratch it with a pocketknife and light does not pass through it(hold it up in front of a flashlight).
answered Jul 18, 2016 by Weasel (57,940 points)

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