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Formula: Ca6Mn2+Pb2(Si3O9)2(SO4)2(OH)2.4H2O
Cyclosilicate (ring silicate), manganese-bearing mineral
Crystal System: Monoclinic
Specific gravity: 3.433 measured, 3.44 calculated
Hardness: 3
Streak: White
Colour: White, greyish white
Common impurities: Sr,Na,K,C
Environments
Roeblingite occurs in zinc-manganese ores and in
Precambrian metamorphosed sediments
(Dana).
To date (July 2020) it has been found in only two localities.
Associated minerals include garnet, titanite,
zircon, phlogopite,
axinite, willemite,
datolite, baryte,
calcite, arsenopyrite,
sphalerite, rhodonite and
rhodochrosite
(HOM).
Localities
At Långban, Filipstad, Värmland County, Sweden, roeblingite occurs as fracture ̄fillings in a metamorphosed
iron-manganese orebody
(HOM).
At the type locality, the Parker shaft, Franklin Mine, Franklin Mining District, Sussex county, New Jersey, USA, roeblingite
was found as compact masses of minute prismatic crystals, in a highly altered zone in a
zinc-manganese-iron
silicate-oxide orebody, in or
near the limestone-granite contact.
Associated minerals include axinite, willemite,
hancockite, ganophyllite,
clinohedrite, datolite,
baryte, andradite,
arsenopyrite, sphalerite,
titanite, rhodonite and
rhodochrosite
(AM 51.504-508, Mindat).
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