...Cristian Biagioni; Luca Bindi; Federica Zaccarini A bstract Three specimens of galkhaite from the Getchell mine (G), Nevada, USA; the Gal-Khaya As-Hg-Sb deposit (Gk), Yakutia, Russia; and Signols (S), Piedmont, Italy, have been fully characterized through single-crystal X-ray diffraction...

... the relationship(s) between the dated mineral and hydrothermal activity are equivocal in many cases. Galkhaite, a trace component of at least four CTDs in Nevada, contains significant amounts of Rb and virtually no Sr, making it an ideal candidate for radiometric dating. At the Getchell deposit, galkhaite...

... but also suffer from a less than clear association with Au. Rb-Sr dating of galkhaite, an Hg sulfosalt, provides the only direct age of mineralization, but galkhaite has been recognized in only a few locations (and dated in only two deposits). In a similar manner, adularia is contemporaneous with Au...

... pyrite in overprinted samples. The pregold vein assemblage was fractured and cemented by gold ore-stage mineralization The gold ore-stage assemblage consists of gold- and arsenic-enriched pyrite and marcasite encompassed by jasperoid and drusy quartz, and local late fluorite, orpiment, and galkhaite...

...) outcropping near the hamlet of Signols (Oulx, Susa Valley, Torino, Piedmont, Italy). The new species is associated with sulfur and orpiment; in the same occurrence galkhaite, stibnite, and enargite were also identified. Ambrinoite occurs as aggregates of tabular crystals up to 1 mm in length. The color is red...

.... The new species is associated with orpiment, rarely with galkhaite, hutchinsonite and cinnabar. The strongly silicified matrix of the specimens has veinlets of sphalerite, with rare inclusions of galena and various (Cu)-Pb-As(Sb) sulphosalts. Daliranite occurs as matted nests of acicular and flexible...

... that pyritization occurred in addition to sulfidation. Cs is a component of galkhaite, a trace mineral that is relatively common in some parts of the Getchell system. Decarbonitization removed as much as 95 wt percent calcite from mineralized rocks in some transects and is responsible for loss of Ca, Mn, Sr, and Sc...

... (500 ppm) and Fe (200 ppm). Disseminated assemblages include; the gold-pyrite-quartz in the ore bodies; the thallium-arsenic assemblage of ellisite-christite-lorandite-getchellite-realgar-native arsenic-quartz; the mercury assemblage of galkhaite-cinnabar-quartz; and the carlinite-pyrite-hydro-carbon...

...Fig. 3. Structural fragments of the crystal structure of tetrahedrite group ( a ), galkhaite group ( b ), and routhierite group minerals ( c ), organised around the Laves polyhedra, showing their topological relationships. Polyhedra: grey =  M (1) site in tetrahedrites, (Hg/Fe,Cu) site...