Formula: Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13
Origin of name: For R. Howie, English mineralogist
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell:
Colour: Dark green to black
Diaphaneity:
Luster: Greasy
Habit: Crystals bladed
Hardness:
Specific gravity: 3.38
Cleavage: 3; {010} good, {100} fair, {2-10} weak
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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