Formula: (Fe,Mn)6(Fe,Al)3Si6O20(OH)5
Origin of name: For William Deer, British mineralogist
Crystal system: Monoclinic, pseudo-orthorhombic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Transparent on thin edges
Luster:
Habit: Crystals acicular
Hardness:
Specific gravity: 3.84
Cleavage: 1; {110} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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