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aegirine

A Dictionary of Earth Sciences | 1999 | 330 words | Copyright

aegirine Pyroxene mineral, NaFe3+Si2O6; sp. gr. 3.5; hardness 6; monoclinic; greenish-black or brown; occurs as fairly short, prismatic crystals in igneous and metamorphic rocks. A variety intermediate in composition between aegirine and augite is called ‘aegirine—augite’. See also AUGITE; and CLINOPYROXENE.

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AILSA ALLABY and MICHAEL ALLABY. "aegirine." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>.

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