aegirine

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aegirine

Aegirine crystals from Magnet Cove, Arkansas

(credit: Courtesy of the Field Museum of Natural History, Chicago; photograph, John H. Gerard)

Pyroxene mineral, sodium and iron silicate (NaFe⁺³Si₂O₆), commonly found in alkaline igneous rocks, particularly in syenites (composed of an alkali feldspar and a ferromagnesian mineral) and syenite pegmatites. It also occurs in schists. Aegirine is generally dark green to greenish black.

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