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Formula: Mn2+Sn4+(OH)6
Hydroxide, schoenfliesite subgroup,
paramorph of
tetrawickmanite,
manganese-bearing mineral
Crystal System: Isometric
Specific gravity: 3.89 measured
Hardness: 4 to 4½
Streak: White
Colour: Brownish yellow, yellow
Solubility: Slowly soluble in common acids
Common impurities: Ca
Environments
Pegmatites
Metamorphic environments
Hydrothermal environments
Wickmanite is a rare manganese and tin bearing mineral.
Localities
At Llallagua, Bolivia, wickmanite occurs in cavities in stannite (Dana) and
has been identified as the host mineral for epitactic overgrowths of jeanbandyite
(Minrec 37.2.158).
At El Hamman, Morocco, wickmanite is associated with burtite,
stokesite, datolite,
pectolite and apophyllite
(HOM).
At Tvedalen, Norway, wickmanite occurs in a
nepheline syenite pegmatite
(HOM, Dana).
Wickmanite from Tvedalen - Image
In the Ladoga Region, Republic of Karelia, Russia, wickmanite has been found in a hydrothermal mineral deposit in altered
garnet skarn
(HOM, Dana).
At the type locality, Långban, Filipstad, Värmland County, Sweden, wickmanite is a rare late-stage, low-temperature mineral
in magnetite ore and jacobsite -
richterite - manganoan biotite
skarn in a metamorphosed iron-manganese orebody. Associated minerals include
bementite, allactite,
calcite, baryte and
magnetite
(HOM, AM 53.1063 ).
Wickmanite from Långban - Image
At Whealcock Zawn, Botallack, Cornwall, England, UK, wickmanite is associated with
stokesite, axinite,
grossular, pargasite,
apatite, titanite,
orthoclase and chalcopyrite
(HOM, Dana).
At the Foote Lithium Co. Mine, Kings Mountain, Cleveland County, North Carolina, USA, a large crystal of wickmanite,
2.4 mm in size, has been found on albite with
pyrite
Mindat photo).
Wickmanite from the Foote Mine - Image
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