Formula: (Mn,Mg)24Zn3Fe(AsO3)2(AsO4)3(SiO4)6(OH)18
Origin of name: For A. and F. Kraissl, Jr., American amateur mineralogists
Crystal system: Hexagonal
Crystal class: 622
Twinning:
Unit cell:
Colour: Coppery-brown
Diaphaneity:
Luster: Submetallic
Habit: Scales to coarse plates, thin, curved, compact
Hardness: 3 to 4
Specific gravity: 3.88
Cleavage: 1; {0001} perfect
Tenacity:
Streak: Golden brown
Synonyms/varieties:
Comments:
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