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www.mineralgallery.co.za Minerals F-J |
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Groutite |
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Name
Groutite
Chemistry
4(MnO.OH)
Uses
As a mineral specimen
Color-
Black
Hardness
5-6
Specific gravity
4.14 (alternating due to impurities)
Crystal system:
Orthohombic, Pyramidal crystals
Accompanied by:
Ankerite
Fracture
Uneven
Luster
Submetalic to adamantine lustre.
Cleavage
perfect cleavage in one direction
Streak
Dark brown streak
Minute, shiny, flat, black striated crystals of groutite were found together with bultfonteinite at N'Chwaning II mine and small barrel shaped crystals and crystal rosettes up to 3 mm in size were found at the Gloria Mine, Kalahari Manganese field.
Occurences: USA-Minnesota (Cuyuna Range)
Kalahari Manganese fields
It is a diaspore mineral.
