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Formula: Mn(SO4).7H2O
Hydrated manganese sulphate, melanterite group
Crystal system: Monoclinic
Specific gravity: 1.846 measured on artificial material, 1.838 calculated
Hardness: 2
Streak: White
Colour: Light rose-pink, colourless in transmitted light
Solubility: Water-soluble, rapidly dehydrates at room temperature
Environments
Mallardite is a rare mineral formed by oxidation of Fe–Mn sulphides and carbonates under conditions of
saturated relative humidity, typically post-mine, when it may be seasonal
(HOM).
Localities
At Broken Hill, Broken Hill district, Yancowinna Co., New South Wales, Australia, mallardite is associated
with alabandite
(HOM).
At Chvaletice, Pardubice District, Pardubice Region, Czech Republic, mallardite is associated with
melanterite,
chvaleticeite,
epsomite, jokokuite,
rozenite, ilesite,
copiapite and gypsum
(HOM).
Mallardite from Chvaletice - Image
At the Johkoku mine, Kaminokuni, Hiyama District, Hiyama Subprefecture, Hokkaidō Prefecture, Japan,
mallardite is associated with jokokuite,
ilesite, rhodochrosite,
manganese-bearing calcite and
kutnohorite
(HOM).
At the type locality, the Lucky Boy Mine, Bingham Mining District, Salt Lake County, Utah, USA, mallardite
is associated with manganese-bearing
melanterite
(HOM).
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