... FeTe 2 S 4 ) according to the microprobe analyses of 13 grains. It occurs in close association with galena, chalcopyrite, hessite, cervelleite (?), acanthite and native silver. The second one has the composition Ag 16.08 Fe 1.01 Bi 0.94 Te 3.03 S 7.95 (stoichiometric Ag 16 FeBiTe 3 S 8 ) from 3...

...Fig. 4. Mineral assemblages of gold and silver chalcogenides (SEM photomicrographs). a, b , Petrovskaite (Pet) and uytenbogaardtite (Uyt) rims on electrum (550–610‰); c , rims of acanthite on chalcopyrite and Ag-sulfoselenides; d, microinclusions of Se-cervelleite (Cerv Se ) and galena (Ga...

...- and Te-bearing Au–Ag chalcogenides (naumannite, cervelleite, and hessite), ore formation with gold–silver–sulfosalt mineralization at the Pepenveem deposit took place at lower temperatures and lower selenium, tellurium, and oxygen fugacity. The data obtained permit us to refer the Pepenveem deposit...

... and natural aguilarite; and (3) demonstrate how earlier researchers erred in describing aguilarite as orthorhombic. The Te-bearing composition of the studied aguilarite crystal suggests the possibility of a solid solution with cervelleite (Ag 4 TeS). * E-mail: luca.bindi@unifi.it aguilarite...

..., pearceite–polybasite and Au-Ag alloy. Locally, Se and/or Te-enriched minerals include galena Pb(S 0.9–1 Se 0.1–0 ), hessite Ag 2 (Te 0.9–1 Se 0.1–0 ), Se-rich cervelleite Ag 4 (Te 1.3–0.9 S 1–0.5 Se 0.5–0.2 ), and also alburnite [Ag 8 GeTe 2 S 4 ] and benleonardite [Ag 15 Cu(As,Sb) 2 S 7 Te 4 ]. Pearceite...

..., in the province of Chubut, Argentina. The new mineral species is predominantly associated with pyrite, sphalerite, chalcopyrite, hematite, native gold and galena; less common associates are aikinite, wittichenite, miharaite and cervelleite. Angelaite forms subhedral, commonly oriented inclusions in galena...

..., altaite, native tellurium, stützite, cuprian cervelleite, and an unnamed Cu-bearing precious metal sulfotelluride [(Ag,Au,Cu) 9 Te 2 S 3 ] characterize the early substage, whereas melonite, rickardite, vulcanite, weissite, and native tellurium are present in the middle substage. The late substage...

... and cervelleite. An alloy of Au–Ag is subordinate, and mainly observed as micro-inclusions in hessite. A Te-rich argyrodite with a mean composition close to Ag 8.04 Ge 0.90 Te 2.07 S 3.77 was also identified in one of the veins investigated. The Ge content of sphalerite and tetrahedrite is below the detection...

... values are close to those of petzite (37.8–45.0%) and hessite (39–43.6%) in air. However, kurilite has convex reflectance curves that are similar to cervelleite (Ag 4 TeS) or aguilarite (Ag 4 SeS) ( Fig. 1 ). T able 1. Reflectance data for kurilite. Wavelength (nm) Air Oil...

... therein Tash-Tau deposit Cu-Zn-Pb-Au±barite (“Kuroko type”) Middle Devonian Ural Mts., Russia Unknown Hessite (Ag 2 Te), cervelleite-like mineral Tellurides occurring in bornite-bearing ore as trace mineral phases together with gold, electrum, jalpaite, germanite, and stromeyerite Cervelleite...

... tellurides ( Novoselov et al. , 2006 ). Estimates of the crystallization temperatures for sulfotellurides such as cervelleite, Ag 4 TeS, have been proposed as >270°C by Karup-Møller ( 1976 ) and 160–260°C by Helmy ( 1999 ). Metastable sulfotellurides in association with native tellurium are thought...

... a vermiform or myrmekitic intergrowth of fine-grained cervelleite (pale-greenish-grey). The sample (catalogue number E.1161 BM 1985, 354) is the type specimen for both benleonardite and cervelleite. ...