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Formula: [Pb3(Pb,Sb)3S6](Au,Te)3
Sulphide, antimony- and tellurium-
bearing mineral
Crystal System: Monoclinic
Specific gravity: 7.35 to 7.49 measured, 7.29 calculated
Hardness: 1 to 1½
Streak: Blackish lead-grey
Colour: Black-grey
Luminescence: None under UV light
Common impurities: Ag,Fe,Bi
Environments
Nagyágite occurs in
gold-tellurium epithermal hydrothermal
veins. Common associates include altaite,
calaverite, galena,
gold, pyrite and
tellurobismuthite
(Mindat).
Localities
At the Bohuliby deposit, Bohuliby, Petrov, Prague-West District, Central Bohemian region, Czech Republic,
nagyágite occurs as lamellar subhedral crystals in intimate intergrowth with
buckhornite in a quartz
gangue containing pyrite,
tellurobismuthite, altaite,
galena, calaverite and native
gold
(AM 80.188).
At the type locality, Săcărâmb, Certeju de Sus, Hunedoara, Romania, nagyágite is associated with
altaite, petzite,
stützite, sylvanite,
tellurantimony,
coloradoite, krennerite,
arsenic, gold,
proustite, rhodochrosite,
arsenopyrite, sphalerite and
tetrahedrite
(HOM).
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