Formula: MnO(OH)
Origin of name: For W. Feitknecht, Swiss chemist
Crystal system: Hexagonal
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Iron-black to brownish black
Diaphaneity: Translucent to nearly opaque
Luster: Dull
Habit: Crystals hexagonal platelets, submicroscopic
Hardness:
Specific gravity: 3.80
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Trimorphous with groutite and manganite
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