This is a crystal of olivine within the igneous rock basalt.
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Image from: Andrew Alden, About.com Geology Guide
Find out how to identify minerals (...and learn what shape, luster, color, streak, hardness, cleavage and fracture are all about!)
Meet some other silicate minerals!
The mineral that is green is called olivine!
Look for it in igneous and metamorphic rocks. In this picture, olivine is filling a hole in the igneous rock.
Last modified April 16, 2003 by Lisa Gardiner.
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