acmite
noun
ac·mite
ˈak-ˌmīt
plural -s
: a mineral consisting of a brown or green silicate of sodium and iron NaFe(SiO3)2 belonging to the pyroxene group and often found in long prismatic crystals characteristically pointed (hardness 6–6.5, specific gravity 3.50–3.55)
called also aegirite
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Merriam-Webster unabridged
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