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aegirine
(redirected from Acmit)

    Also found in: Wikipedia 0.01 sec.

aegirine

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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.

aegirine [′ā·gə‚rēn]
(mineralogy)
NaFe(SiO3)2A brown or green clinopyroxene occurring in alkali-rich igneous rocks. Also known as aegirite.
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