Putoranite

putoranite

talnakhite

mooihoekite

pentlandite

Images

Formula: Cu1.1Fe1.2S2
Sulphide, talnakhite group
Specific gravity: 4.48
Hardness: 4½
Streak: Black
Colour: Yellow
Common impurities: Ni
Environments

Plutonic igneous environments

Localities

At Monchegorsk, Murmansk Oblast, Russia, putoranite occurs in copper-nickel mineralisation in peridotite (HOM).

At the type locality, the Oktyabrsky mine, Talnakh Cu-Ni Deposit, Noril'sk, Putoran Plateau, Taimyr Peninsula, Taymyrskiy Autonomous Okrug, Krasnoyarsk Krai, Russia, putoranite occurs in the massive mooihoekite ores in close association with mooihoekite and talnakhite. Macroscopically putoranite is similar to mooihoekite and talnakhite, and nickeloan putoranite oxidises quickly in air, like talnakhite, producing a variegated tarnish. In reflected light putoranite is similar in colour and reflectance to mooihoekite. It occurs as dense coarse-grained aggregates up to 2 cm which consist of fine intergrowths of putoranite and mooihoekite with indistinct, diffuse boundaries. It also occurs as polysynthetically twinned intergrowths and rarely as single crystals. Besides mooihoekite and talnakhite, cubanite, pentlandite and magnetite are frequently associated with putoranite. Other associates include galena, sphalerite, platinum-group minerals, native silver, alabandite and secondary minerals such as valleriite, mackinawite, cuprian pentlandite, and more rarely manganoan shadlunite and djerfisherite (AM 66.638-639).

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