... sediment at the redox boundary above the water table containing realgar, an unidentified As-S compound, and a magnesium (Mg)-arsenate phase; Facies (IV) structureless, As-poor, pale brown sediment composed of diatom frustules; and Facies (V) algal-rich surface sediment containing hörnesite [Mg3(AsO4)·8H2O...

..., associated with dufrénoysite, hatchite, realgar and baryte. Minimum and maximum reflectance data for COM wavelengths in air are [λ (nm): R (%)]: 471.1: 25.8/27.1; 548.3: 25.2/26.6; 586.6: 24.6/25.8; 652.3: 23.9/24.8. Electron microprobe analyses give (wt.%): Cu 2.01(6), Ag 8.50(16), Zn 10.94(20), Fe 3.25(8...

...L. Bindi; F. Nestola; S. Graeser; P. Tropper; T. Raber AbstractEckerite, ideally Ag2CuAsS3, is a new mineral from the Lengenbach quarry in the Binn Valley, Valais, Switzerland. It occurs as very rare euhedral crystals up to 300 μm across associated with realgar, sinnerite, hatchite, trechmannite...

...Giovanni Pratesi; Matteo Zoppi AbstractThe light-induced alteration of realgar and β-As4S4 is a well-known phenomenon but still displays interesting aspects not completely explained. In the transformation from realgar to pararealgar the molecule As4S4 undergoes a structural modification, and ever...

... crystals up to 100 μm across associated with realgar, sulfur, wakabayashilite, alacránite, non-stoichiometric As4S4+x sulfides and stibnite in a calcite matrix. In thick section, bonazziite is opaque with a resinous lustre and a dark-orange streak. It is brittle; the Vickers hardness (VHN15) is 70 kg/mm2...

...L. Bindi; F. Nestola; E. Makovicky; A. Guastoni; L. De Battisti AbstractPhilrothite, ideally TlAs3S5, is a new mineral from the Lengenbach quarry in the Binn Valley, Valais, Switzerland. It occurs as very rare crystals up to 200 μm across on realgar associated with smithite, rutile and sartorite...

.... These fractures house veinlets that contain a number of Ag-As-Sb-Pb-rich sulfosalts, tetrahedrite-tennantite, realgar, pyrite and electrum. Barikaite appears as inclusions in guettardite. The mineral is opaque, greyish black with a metallic lustre; it is brittle without any discernible cleavage. In reflected...

... Alps, Tuscany, Italy). It occurs as compact masses associated with barite, boscardinite, calcite, cymrite, dolomite, pyrite, realgar, routhierite, sphalerite, and stibnite. Protochabournéite is metallic black. Minimum and maximum reflectance data for COM wavelength are [λ (nm): Rair (%)]: 470: 36.4...

..., 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 (VHN10) of 52 kg mm−2 (range 50–55) corresponding to a Mohs hardness of 2½–3...

..., associated with realgar, rutile, trechmannite and hutchinsonite. Debattistiite is opaque with a metallic lustre and a grey streak. It is brittle; the Vickers hardness (VHN25) is 80 kg mm−2 (range: 65–94), corresponding to a Mohs hardness of 2–2½. In reflected light debattistiite is dark grey, highly...

... that contain a number of Ag–As–Sb–Pb-rich sulfosalts, tetrahedrite–tennantite, realgar, pyrite and Au–Ag alloy. The variation in the chemical composition of guettardite is minor: Pb0.95–0.96Sb0.96–1.02As1.03–1.06S3.99–4.02. The lattice parameters were determined from a single crystal as a 8.527(4), b 7.971(4...

... and realgar. The crystals of alfredstelznerite are euhedral, elongate along [001], with {010}, {hk0}, {100}, {hkl} and {h̅kl} as common crystallographic forms. The cleavage is perfect parallel to {010}, the hardness is 2, the streak is white, the luster is vitreous to silky, the density in g/cm3 is 1.77(1...

...), As-bearing sulfates (jarosite [(K,Na,H3O)Fe3(SO4)2(OH)6], tooeleite [Fe6(AsO3)4(SO4)(OH)4·4H2O]) and realgar (As4S4). Arsenic-bearing HFO (2.5% As) and goethite (0.08% As) were identified in the single B-horizon soil sample. This study is part of a broader coordinated effort by a multi-department federal...

..., 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...

...R. M. Tosdal; J. S. Cline; C. Mark Fanning; J. L. Wooden AbstractLead isotope compositions of bulk mineral samples (fluorite, orpiment, and realgar) determined using conventional techniques and of ore-stage arsenian pyrite using the Sensitive High Resolution Ion-Microprobe (SHRIMP) in the Getchell...

...John A. Groff; Andrew R. Campbell; David I. Norman AbstractCarlin-type deposits contain gold in association with main-stage quartz-pyrite-kaolinite mineralization and late-stage orpiment-realgar-calcite-barite mineralization. Fluid characteristics for main-stage mineralization are well documented...

.../V Sonne completed detailed mapping and sampling of the seafloor around Lihir Island in Papua New Guinea. Sampling of Conical Seamount resulted in the discovery of an unusual occurrence of alacranite and realgar associated with polymetallic vein mineralization consisting of pyrite, sphalerite, galena...

... from natural assemblages. Realgar which occurs as euhedral crystals in median vein cavities is similar, but not identical to “normal” realgar, or β-AsS, from other localities. The relationships between the two forms are poorly-defined, but neither exhibits instability on exposure to light...