Formula: MnZn2(SiO4)(OH)2
Origin of name: For H. Hodgkinson, discoverer of mineral
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 11.76 Ǻ, b = 5.32 Ǻ, c = 8.18 Ǻ, β = 95.4°
Colour: Bright pink to reddish brown
Diaphaneity:
Luster: Vitreous
Habit: Crystals acute pyramidal or stout prismatic; massive, granular
Hardness: 4.5 to 5
Specific gravity: 3.91 to 3.99
Cleavage: 1; {001} perfect
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
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