acmite
noun
ac·mite
\ˈak-ˌmīt\
Definition of acmite
-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
From the M-W Editors
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Origin and Etymology of acmite
German achmit, from Greek akmē + German -it -ite
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