Wiserite

wiserite

sussexite

pyrochroite

alleghanyite

Images

Formula: Mn2+14(B2O5)4(OH)8.(Si,Mg)(O,OH)4Cl
Compound borate
Specific gravity: 3.42 calculated
Hardness: 2½
Streak: White
Colour: Yellowish white, pink-brown, light red
Common impurities: Fe,Ca,H2O
Environments

Metamorphic environments
Hydrothermal environments

Wiserite is an accessory mineral in stratiform manganese deposits associated with hausmannite, jacobsite, alleghanyite, pyrochroite, pyrobelonite, calcite, rhodochrosite, jimboite, sussexite, alabandite, galaxite, tephroite and gageite (HOM.

Localities

At the type locality, the Gonzen Mine, Sargans, St. Gallen, Switzerland, wiserite occurs in veins of rhodochrosite - hausmannite ore associated with sussexite, rhodochrosite, pyrochroite, hausmannite, fluorite and baryte (Mindat).

At the Kombat mine, Namibia, wiserite was found associated with hausmannite, jacobsite, calcite, alleghanyite and pyrochroite on the hanging-wall side of a thin lens of layered manganese ores in unmetamorphosed dolomite AM 74.1374-1376

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