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.
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The Fall 2010 issue of The Earth Scientist
, focuses on rocks and minerals, including articles on minerals and mining, the use of minerals in society, and rare earth minerals, and includes 3 posters!
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