Manganite: Steel-gray or iron-black crystals composed of manganese oxide. Used as a source of manganese.
MANGANITE
Bridge of Don, Aberdeen, Aberdeenshire.
A group of crystals to c 2mms.
BARITE - Portknockie, Banffshire.
A 6mm crystal with zoned hematite inclusions.
Examples of hydroxides are manganite (MnO(OH)), goethite (FeO(OH)), and gibbsite (Al(OH)3; one of the main components of bauxite). Minerals of the hydroxide class are typically softer than oxides and are of low to medium density.
Manganite...manganese oxide... MnO(OH)
Crystal system: monoclinic - prismatic
Color: steel gray to black
Luster: submatilic
Hardness: 4
SG: 4.2 - 4.4
Streak: reddish brown
Cleavage: perfect side, poor prismatic and basal ...
 See also: Minerals, Agate, Crystal, Mineral, Color
  
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