Formula: Mn7(SiO4)3(OH)2
Origin of name: From Greek for white and purple-red
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Common on {100}, contact, penetration, lamellar
Unit cell: a = 10.84 Å, b = 4.83 Å, c = 11.32 Å, β = 103.9°
Colour: Light pink to deep pink, purplish red, brown
Diaphaneity:
Luster: Vitreous
Habit: Crystals slender prismatic or thin tabular, small, rare; massive granular; isolated grains
Hardness: 5.5 to 6
Specific gravity: 3.85
Cleavage: 1; {001} imperfect
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
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