...George W. Roland Abstract A phase of AgAsS 2 composition prepared by crystallizing AgAsS 2 glass at 290°C for 315 hours is identical to the rare sulfosalt mineral trechmannite. The synthetic material is hexagonal (rhombohedral) and least-squares refinement of X-ray powder-dif-fraction data yields...

...L. Taras Bryndzia; O.J. Kleppa Abstract High‐temperature direct‐synthesis calorimetry of the silver thioarsenite minerals smithite (AgAsS 2 ), trechmannite (AgAsS 2 ), and proustite (Ag 3 AsS 3 ) at 793 K yielded mean values for the standard enthalpy of formation from the elements of −59.1 ± 2.3...

...Jose Maria Pons; Enric Vicens; Angélica Oviedo; Javier Aguilar; Pedro García-Barrera; Gloria Alencáster A bstract A Maastrichtian rudist fauna composed of the radiolitids Biradiolites aguilerae Böse, B. Cárdenasensis Böse, Huasteca ojanchalensis (Myers), Tampsia floriformis Myers, and Trechmannites...

..., such as hutchinsonite, hatchite, edenharterite, trechmannite, tennantite, and abundant realgar and rathite, generally occurring as idiomorphic crystals in cavities of a Triassic dolomitic rock. The whole region was transformed during the Alpine orogeny to the greenschist to garnet-amphibolite facies of metamorphism...

... encountered: proustite and xanthoconite (both Ag 3 AsS 3 ), smithite and trechmannite (both AgAsS 2 ), and Ag 7 AsS 6 . The phase relations of proustite were studied in detail. The maximum temperatures at which proustite can coexist with either Ag 7 AsS 6 , Ag 2 S, As, or smithite are, respectively, 480...

..., trechmannite and yellow, fibrous smithite. In thick section eckerite is opaque with a metallic lustre and shows a dark orange-red streak. It is brittle; the Vickers hardness (VHN 25 ) is 70 kg/mm 2 (range: 64–78) (Mohs hardness of ~2½–3). In reflected light, eckerite is moderately bireflectant and weakly...

... smithite, realgar, hatchite and probable trechmannite, edenharterite, jentschite and two unidentified sulfosalts. Raberite is opaque with a metallic lustre and has a dark brown–red streak. It is brittle with a Vickers hardness (VHN 10 ) of 52 kg mm −2 (range 50–55) corresponding to a Mohs hardness of 2½–3...

... marble, associated with realgar, rutile, trechmannite and hutchinsonite. Debattistiite is opaque with a metallic lustre and a grey streak. It is brittle; the Vickers hardness (VHN 25 ) is 80 kg mm −2 (range: 65–94), corresponding to a Mohs hardness of 2–2½. In reflected light debattistiite is dark grey...

...), trechmannite (crosses) and proustite (open circles). ...

... specimens from zone 1 of the quarry in cavities in dolomitic marble with realgar, rutile, trechmannite, and hutchinsonite. The mineral occurs as very rare tabular euhedral black, opaque crystals up to 150 μm with a metallic luster and a gray streak. It is brittle with uneven fracture and no cleavage...

... deposited during synvolcanogenic hydrothermal activity ( Khodaparast et al . 2010 ). Brittle deformation fractures host veinlets that contain a number of Ag-As-Sb-Pb-rich sulfosalts ( Makovicky et al. 2012 ) including tetrahedrite-tennantite, stephanite, pyrargyrite, trechmannite, smithite, miargyrite...

...) , Hall (1968) , Keighin & Honea (1969) , and Wehmeier et al . (1968) . In the Ag-As-S system, billingsleyite, proustite, smithite, and trechmannite were synthesized and their phase equilibria were determined by Toulmin (1963) , Hall (1966 , 1968 ), Roland (1970) , and Wehmeier et al. (1968...

... to dark blue. All of these properties are enhanced upon immersion in oil. Several minerals with the chemical formula AgMS 2 (M = As, Sb, Bi) have previously been described: (1) M = As: monoclinic smithite ( Hellner and Burzlaff 1964 ), trigonal trechmannite ( Matsumoto and Nowacki 1969 ); (2) M = Sb...

... the original situation. Fractures host veinlets that contain a number of Ag-As-Sb-Pb-rich sulfosalts: tetrahedrite-tennantite, stephanite, pyrargyrite, trechmannite, smithite, miargyrite, andorite, geocronite, seligmannite, guettardite ( Makovicky et al. , 2012 ), and in addition, realgar, pyrite and Au-Ag...

... veinlets with Ag-As-Sb-Pb-rich sulfosalts: tetrahedrite-tennantite, stephanite, pyrargyrite, trechmannite, smithite, miargyrite, andorite, geocronite, seligmannite, guettardite and realgar and Ag-Au alloys. Barikaite is always found in association with guettardite in quartz veins hosting irregular thin...