Formula: (Mg,Fe)7(SiO4)3(F,OH)2
Origin of name: For Abraham Hume, English collector
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 10.24 Ǻ, b = 20.72 Ǻ, c = 4.735 Ǻ
Colour: White, yellow, dark orange, brown
Diaphaneity:
Luster: Vitreous
Habit: Crystals varied habit, highly modified, small
Hardness: 6
Specific gravity: 3.24
Cleavage: 1; {100} indistinct
Tenacity: Subconchoidal to uneven; brittle
Streak:
Synonyms/varieties:
Comments:
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