Alpeite
(repeating unit)Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6 IMA symbol Apt Identification Color Brownish red Tenacity Brittle Mohs scale hardness 5.5-6 Luster Vitreous, Silky Streak Beige Diaphaneity Transparent Specific gravity 3.374
Alpeite (IMA symbol: Apt[1]) is a calcium manganese magnesium silicate mineral with the chemical formula Ca4Mn3+2Al2(Mn3+Mg)(SiO4)2(Si3O10)(V5+O4)(OH)6. It is named for its type locality, the Monte Alpe mine in Italy.[2]
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