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Formula: Mn2+14(B2O5)4(OH)8.(Si,Mg)(O,OH)4Cl
Metaborate, manganese-bearing
mineral
Crystal System: Tetragonal
Specific gravity: 3.54 measured, 3.57 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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