Formula: (Mn1-xFex)Al(PO4)(OH)2-xOx
Origin of name: For T. Ernst, German mineralogist
Crystal system: Monoclinic
Crystal class: m or 2/m
Twinning:
Unit cell: a = 13.32 Ǻ, b = 10.48 Ǻ, c = 6.97 Ǻ, β = 90.4°
Colour: Yellow-brown
Diaphaneity:
Luster:
Habit: Radiating aggregates
Hardness: 3 to 3.5
Specific gravity: 3.07
Cleavage: 2; {010} and {100} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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