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Omphacite

The Pyroxene Minerals

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Omphacite is a rare grass-green pyroxene with the formula (Ca,Na)(Fe2+,Al)Si2O6. It is typical of the high-pressure metamorphic rock eclogite.
High-pressure sodium pyroxene
Photo (c) 2005 Andrew Alden, licensed to About.com (fair use policy)
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