Isomertieite

isomertieite

arsenopalladinite

atheneite

palladseite

Images

Formula: Pd11Sb2As2
Arsenide, isomertieite group, paramorph of mertieite-I
Specific gravity: 10,33 calculated
Hardness: 5½
Colour: Pale yellow in reflected light
Common impurities: Au,Cu
Environments

Pegmatites
Metamorphic environments
Hydrothermal environments

Isomertieite occurs in heavy metal concentrates with gold and other palladium minerals (Dana).

Localities

At the type locality, Itabira, Minas Gerais, Brazil, isomertieite occurs In heavy-metal concentrates from Precambrian iron-precious metal deposits. Associated minerals include arsenopalladinite, atheneite, palladseite, hematite and gold (MM 39.528-543, HOM, Mindat).

At the Lac des Iles Complex, Lac des Iles Area, Thunder Bay District, Ontario, Canada, isomertieite is associated with chalcopyrite, millerite, kotulskite, arsenopalladinite and hematite (HOM). The complex is a mafic-ultramafic intrusive complex with gabbro and pegmatites, that contains several platinum group element (PGE) mineralisations (Mindat).

At the Hongshila Pt-Pd deposit, Boluonuo, Fengning County, Chengde, Hebei, China, isomertieite is associated with hongshiite, cooperite, sperrylite, vysotskite, magnetite, bornite, polydymite, diopside, actinolite and epidote (HOM). The deposit is a platinum group element (PGE)-bearing ultramafic body, intruded into metamorphic rocks, mainly hornblende-plagioclase gneiss, with minor schist and marble (Mindat).

At Hope's Nose, Torquay, Torbay, Devon, England, UK, gold alloyed with up to 16% palladium occasionally hosts tiny crystals of isomertieite and mertieite-II (R&M 96.3.202). The deposit is in precious (Au, Ag, Pd) and base metal selenide mineralisation in calcite veins (Mindat).

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