Mertieite II

mertieite II





Formula: Pd8Sb2.5As0.5
Arsenide of palladium and antimony
Crystal System: Trigonal
Specific gravity: 11.2 calculated
Hardness: 6
Colour: Brassy ye+llow
Common impurities: Cu,Sn

Sedimentary environments
Hydrothermal environments

Mertieite II occurs associated with gold, sperrylite, laurite, platarsite, ruthenarsenite, mertieite I, genkinite, platinum-iridium-osmium alloys, a platinum-iron alloy, stibiopalladinite, chalcocite, bornite, heazlewoodite, galena, chalcopyrite, pentlandite, valleriite, hauchecornite, parkerite and chromite (HOM).


At the Oktyabrsky Mine, Talnakh Cu-Ni Deposit, Noril'sk, Putoran Plateau, Taimyr Peninsula, Taymyrskiy Autonomous Okrug, Krasnoyarsk Krai, Russia, mertieite II occurs above massive cubanitemooihoekite ore (HOM).

At the Darya River sediments, Sakha Republic, Russia, coarse-grained mertieite II crystals (up to 2.5 mm across) have been found with inclusions of sperrylite and intergrown with keithconnite, cooperite-braggite, a platinum-palladium-mercury alloy, a (Pd,Pt)9Te phase and a gold-silver alloy. The primary platinum group mineral assemblage underwent alteration with formation of a very fine-grained mixture of palladium-bearing oxides and hydrated oxides, occasionally intergrown with goethite. The palladium-oxide-bearing compounds formed after (1) mertieite-II (2) keithconnite and (3) potarite. The variably oxidised and hydrated platinum group mineral assemblage can be attributed to supergene alteration and small-scale element redistribution under cool climatic conditions with a limited degree of leaching (MM 69.6.981–994).

At the type locality, Fox Gulch, Salmon River - Red Mountain District, Goodnews Bay, Bethel Census Area, Alaska, USA, mertieite II occurs as fine grains in precious metal placer concentrates, apparently derived from an ultramafic source rock (HOM).

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