Formula: NaNa2Mn4(Fe,Al)Si8O22(OH)2
Origin of name: For Shukusude Kozu, Japanese mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Reddish black to black
Diaphaneity:
Luster: Vitreous
Habit: Crystals short prismatic forming banded aggregates
Hardness: 5
Specific gravity: 3.30
Cleavage: 1; {110} perfect
Tenacity:
Streak: Light purplish brown
Synonyms/varieties:
Comments:
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