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Formula: MnS
Valence: Mn2+S2-
Simple sulphide of manganese,
wurtzite group, hexagonal
paramorph of isometric
alabandite
and isometric browneite
Crystal system: Hexagonal
Specific gravity:
Hardness: 4
Streak: Brown
Colour: Dark brown to black, brown-red internal reflections
Environments
Sedimentary environments
Hydrothermal environments
Localities
At the Gotland Deep, Baltic Sea, rambergite, which coexists with globules of
rhodochrosite in anoxic, laminated, Baltic Sea sediments rich in
organic matter, occurs as idiomorphic hexagonal crystals about 200 mm long and 150 mm wide
(AM 83.1117-1118).
At the Lichtenberg Absetzer dump, Kauern, Greiz District, Thuringia, Germany, rambergite has been
reported
(HOM).
Rambergite from the Lichtenberg Absetzer dump -
Image
At the Hirogawara mine, Urayama, Chichibu City, Saitama Prefecture, Japan, rambergite has been found in
metasedimentary manganese deposits
(HOM).
At the type locality, the Garpenberg Norra Mine, Garpenberg, Hedemora, Dalarna County, Sweden, rambergite
occurs in cavities in amphibole
skarn associated with
fluorite, apophyllite,
calcite, baryte,
sphalerite, galena,
pyrite, samsonite,
pyrargyrite, pyrrhotite,
and freibergite. Crystals in the
skarn are up to 1.5 mm long, dark brown to black in colour, with a
resinous lustre and brown streak
(AM 83.1117-1118).
It is likely a later stage hydrothermal mineral under low temperature conditions
(HOM).
Rambergite from the Garpenberg Norra Mine -
Image
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