Formula: Mn5As3O9(OH,Cl)
Origin of name: For Nils Magnusson, Swedish official
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning:
Unit cell:
Colour: Grass-green to emerald-green, blue-green
Diaphaneity:
Luster: Vitreous
Habit: Incrustations, fine-grained
Hardness: 3.5 to 4
Specific gravity: 4.30
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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