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A sodium-ferric iron silicate, NaFe3+ Si2 O6 , occurring commonly in soda-rich igneous rocks; monoclinic; Mohs hardness, 6 to 6.5; sp gr, 3.40 to 3.55. Syn: acmite; aegirite. See also: pyroxene
Source: Dictionary of Mining, Mineral, and Related Terms

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