Roeblingite

roeblingite

ganophyllite

hancockite

clinohedrite

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Formula: Ca6Mn2+Pb2(Si3O9)2(SO4)2(OH)2.4H2O
Cyclosilicate (ring silicate)
Specific gravity: 3.433
Hardness: 3
Streak: White
Colour: White, greyish white
Common impurities: Sr,Na,K,C
Environments

Metamorphic 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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