Formula: Mn5-x(Mn, Fe)1+xO8(OH)6 x ≈ 0.2
Origin of name: Locality; Janggun mine, Bonghwa, Korea
Crystal system: Orthorhombic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Opaque
Luster: Dull
Habit: Flakes, radiating groups; masses, dendritic or arborescent; colloform bands
Hardness: 2 to 3
Specific gravity: 3.59
Cleavage: 1
Tenacity:
Streak: Brownish black to dark brown
Synonyms/varieties:
Comments:
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