Bohdanowiczite

bohdanowiczite

uraninite

clausthalite

wittichenite

Images

Formula: AgBiSe2
Sulphosalt, matildite group
Specific gravity: 7.72 calculated
Hardness: 3 to 3½
Colour: Creamy-yellow to pink in reflected light/lead grey
Common impurities: Pb,Cu,Co,Ni,S
Environments

Sedimentary environments
Metamorphic environments
Hydrothermal environments

Localities

At the Iron Monarch open cut, Iron Knob, Middleback Range, Eyre Peninsula, South Australia, polymineralic grains with bohdanowiczite, clausthalite, eucairite and umangite associated wittichenite and bismuthinite have been reported from the sedimentary iron deposit (CM 43.899-908).

At the Buraco do Ouro mine, Cavalcante, Goiás, Brazil, the mineralization is hosted in muscovite-quartz mylonite in a silicified shear zone near the contact between biotite-muscovite granite and paragneiss. The ore mineralogy consists of gold, paraguanajuatite, kalungaite, isomertieite, mertieite II, sperrylite, padmaite, bohdanowiczite, clausthalite, krut'aite, ferroselite, uraninite and unnamed Ag-Pb-Bi-Se minerals. Local magnetite concentrations and rare chalcopyrite and pyrite are also associated with both mineralised and barren mylonite in a gangue consisting of muscovite, quartz and rare tourmaline (MM 81.463–475).

At the Kidd mine, Kidd Township, Timmins, Cochrane District, Ontario, Canada, bohdanowiczite typically forms blebs in bornite or an intergrowth with cobaltite and clausthalite; other associated minerals include tennantite, carrollite, chalcopyrite, chalcocite, naumannite, eucairite and clausthalite (CM 43.899-908, HOM).

At the St Andreasberg Mining District, Lower Saxony, Germany, bohdanowiczite has been noted in selenide-bearing calcitequartz veins from the ancient St Andreasberg silver deposit (CM 43.899-908).

At Frederik VII's Mine, Qaqortoq, Narsaq, Kujalleq, Greenland, bohdanowiczite occurs with hessite, chalcocite, digenite, umangite, naumannite, eucairite, bornite, chalcopyrite, clausthalite, covellite, magnetite, hematite, goethite, malachite and azurite (HOM, AM 55.2135).

At the type locality, Kletno, Gmina Stronie Śląskie, Kłodzko County, Lower Silesian Voivodeship, Poland, bohdanowiczite occurs in magnetite-fluorite veins adjacent to magnetite skarn, and in fluorite-quartz-sulphide veins. Associated minerals include uraninite, clausthalite, chalcocite, tiemannite, umangite, klockmannite, wittichenite, silver, naumannite, bornite, chalcopyrite, fluorite, quartz and emplectite (AM 55.2135, HOM). The bohdanowiczite is considered to have formed by exsolution from its Cu–Bi–Ag–S-bearing clausthalite host (CM 43.899-908).

Bogdanovite occurs with bilibinskite in the supergene zone of oxidation of deposits in Kazakhstan and far eastern USSR, associated with gold, various tellurides, and tellurites of Fe, Cu and Pb (AM 64.1329).

At the Ocna de Fier-Dognecea District, Caraş-Severin, Romania, bohdanowiczitekawazulite intergrowths associated with wittichenite and included in chalcopyrite occur in the iron-copper skarn deposit (CM 43.899-908).

In Eastern Transbaikalia, Zabaykalsky Krai, Russia, bohdanowiczite has been reported intergrown with clausthalite, naumannite, chalcopyrite and bornite in a sulphide deposit (CM 43.899-908).

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