acmite
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acmite
[′ak‚mīt] (mineralogy)
NaFeSi2O6 A brown or green silicate mineral of the pyroxene group, often in long, pointed prismatic crystals; hardness is 6-6.5 on Mohs scale, and specific gravity is 3.50-3.55; found in igneous and metamorphic rocks.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.