Formula: (Mn,Mg,Al)3(Si,Al)2O5(OH)4
Origin of name: For W. Kelly, American geologist
Crystal system: Hexagonal
Crystal class: 6
Twinning:
Unit cell:
Colour: Yellow
Diaphaneity: Transparent
Luster:
Habit: Platy tablets and laths, irregular
Hardness:
Specific gravity: 3.07
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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