Formula: Mn5Al(Si3Al)O10(OH)8
Origin of name: for T. Pennant, Welsh mineralogist
Crystal system: triclinic?
Crystal class: 2/m?
Twinning:
Unit cell:
Colour: orange-red
Diaphaneity: translucent
Luster: pearly on cleavage
Habit: massive, minute flakes
Hardness: 2 to 3
Specific gravity: 3.06
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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