Ferroselite

ferroselite

cobaltomenite

clausthalite

cadmoselite

Images

Formula: FeSe2
Selenide, marcasite group, paramorph of dzharkenite
Specific gravity: 7.20
Hardness: 6 to 6½
Streak: Black
Colour: Steel grey to tin white with rose tint, brass yellow
Common impurities: Co
Environments

Sedimentary environments

Ferroselite occurs in red-bed deposits of the Colorado Plateau type. Associated minerals include uraninite, pyrite, marcasite, chalcopyrite, sphalerite, selenium, clausthalite, cadmoselite, bornite, cobaltomenite, laumontite and baryte (HOM, Mindat).

Localities

At the type locality, the Ust' Uyok deposit, Turan District, Tuva, Russia, ferroselite occurs with minor chalcopyrite and pyrite cementing sandstone and pelites (sedimentary rocks composed of clay or mud-sized particles) (AM 41.671).

At a number of mines in the Uravan district, Montrose county, Colorado, USA, ferroselite occurs in uranium-vanadium ores in sandstone, with coalified wood (HOM).

At several localities on the Colorado Plateau, Utah, USA, ferroselite occure in red-bed deposits of the Colorado Plateau type, peripheral to pyrite and uranium concentrations (HOM).

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