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Nagyagite (Pb5Au(Te,Sb)4S5-8) is a rare sulfide mineral with known occurrence associated with gold ores. Nagyagite crystals are opaque, monoclinic and dark grey to black coloured.
It was first described in 1845 for an occurrence at the type locality of the Nagyag mine, Sacarîmb, Hunedoara, Romania.
It occurs in gold–tellurium epithermal hydrothermal veins. Minerals associated with nagyagite include: altaite, petzite, stutzite, sylvanite, tellurantimony, coloradoite, krennerite, native arsenic, native gold, proustite, rhodochrosite, arsenopyrite, sphalerite, tetrahedrite, calaverite, tellurobismuthite, galena and pyrite.
1. ^ a b c http://www.mindat.org/min-2830.html Mindat.org