Formula: K(Li,Al,Mn)3 (Si,Al)4O10(F,OH)2
Origin of name: For K. Masutomi, Japanese mineralogist
Crystal system: Monoclinic
Crystal class: 2
Twinning:
Unit cell:
Colour: Pale purplish-pink, yellow brown
Diaphaneity: Transparent to translucent
Luster:
Habit: Crystals pseudohexagonal, as druses
Hardness: 2.5
Specific gravity: 2.94
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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