Zvyagintsevite

zvyagintsevite

cubanite

pentlandite

valleriite

Images

Formula: Pd3Pb
Alloy of palladium and lead
Specific gravity: 13.32
Hardness: 4½
Streak: Black
Colour: Creamy white
Common impurities: Cu,Fe,Ni
Environments

Plutonic igneous environments
Hydrothermal environments

Zvyagintsevite occurs as small irregular grains and veinlets in copper sulphides associated with differentiated gabbro-dolerite intrusives (Webmin).

Localities

At the Kirakkajuppura PGE deposit, Sompujärvi Reef, Penikat complex, Lapland, Finland, platinum-poor members of the vysotskite-braggite series, zvyagintsevite, and palladium-lead oxide are the main platinum group minerals. The large aggregates of platinum group minerals are composed mainly of vysotskite-braggite, which is altered and probably oxidised to various degrees, and commonly replaced by very fine-grained aggregates of zvyagintsevite and related secondary platinum group minerals. Also present in these aggregates are members of the malanite-cuprorhodsite series (CM 37.1507-1524).

At the type locality, the Talnakh Cu-Ni Deposit, Noril'sk, Putoran Plateau, Taimyr Peninsula, Taymyrskiy Autonomous Okrug, Krasnoyarsk Krai, Russia, zvyagintsevite was discovered in a small specimen about 4 cm across. The deposit consists mostly of ores of chalcopyrite-pentlandite-pyrrhotite, associated with intrusives of gabbro-dolerite, cutting sandstone-schist. The platinum group minerals are most common in chalcopyrite veins. In the sample, associated minerals include chalcopyrite, cubanite, pentlandite, and minor magnetite and valleriite. Zvyagintsevite occurs as irregular grains, up to 250 microns in size, and veinlets, usually within copper sulphides, and also within valleriite and magnetite. Silver and gold alloy grains were mostly found at the periphery of zvyagintsevite grains (CM 8.541-550). Other associated minerals include talnakhite, polarite and pentlandite (HOM).

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