... transparent, streak blue; optically biaxial (-) with alpha = 1.615(2), beta = 1.660(2), and gamma = 1.700(2) at 589 nm; 2 V obs = 82(2) degrees , 2 V calc = 84(1) degrees . Pleochroism weak with Z = blue, Y = light blue, and X = light blue to colorless. Associated minerals: geminite, lindackerite...

... and pyramids, the OH groups of the As,O,OH tetrahedra and H 2 O molecules localized in the interlayers. A small amount of distorted K octahedra with partial occupancy reinforce these contacts. Some vacancies in the positions of Cu atoms were revealed. The mineral is structurally related to geminite, Cu(AsO 3...

...) ore district, Czech Republic. It is commonly associated with lindackerite, geminite, lavendulan, slavkovite, strashimirite, olivenite, picropharmacolite and köttigite. It forms white, whitish green, grey-green or apple-green crystalline crusts or aggregates composed of fine platy or lath-shaped...

... Republic, commonly associated with lavendulan, geminite, lindackerite and ondrušite. It forms coatings of pale green rosettes up to 1 mm across or individual spherical aggregates up to 5 mm across. Individual acicular to lath-like crystals are up to 1 mm long and 0.05 mm thick, and are colorless...

..., chalcopyrite, native gold, erythrite, talmessite/roselite-beta, Cr-bearing yukonite, alumopharmacosiderite, powellite, and a blue-green earthy copper arsenate related to geminite. The mineral results from the weathering of a Variscan hydrothermal As-Co-Ni-Ag-Au vein. The Bou Azzer mine and the similarly named...

... it appeared that both structures were almost identical they are presented in one paper. Lindackerite occurs in an assemblage with a light apple-green new mineral provisionally named as “pseudo-linda-ckerite” - CaCu 4 (AsO 4 ) 2 (AsO 3 OH) 2 .10 H 2 O ( Ondruš et al. , 1997c ), geminite, lavendulan...

... krautite, koritnigite and cobaltkoritnigite, and comparison of these phases to the chemically related geminite [Cu[AsO 3 (OH)]⋅H 2 O] and haidingerite [Ca[AsO 3 (OH)]⋅H 2 O]. Given the presence of the acidic AsO 3 (OH) group in their structures, it is not surprising that they are predicted to crystallise...

... and straight mine wall exhibiting unusual mineralogy, dominated by copper, zinc, cobalt and nickel. The end of the wall includes a large cavity where 5 out of the 14 new species known at Cap Garonne have been found: geminite (Sarp and Perroud, 1990 ), guarinoite (Sarp, 1993 ), mahnertite (Sarp, 1996...

... in långbanshyttanite are close to that found in the structures of the copper arsenates geminite, Cu(AsO 3 OH)·H 2 O, ( Cooper & Hawthorne, 1995 ; Prencipe et al. , 1996 ), yvonite, Cu(AsO 3 OH)·2H 2 O, ( Sarp & Cerny, 1998 ) and lindackerite, (Cu,Co,Ni)Cu 4 (AsO 4 ) 2 (AsO 3 OH) 2 -·9H 2 O ( Hybler et al...

... cm × 2 cm piece of quartz-gangue with disseminated altered primary sulfides (namely tennantite and chalcopyrite). Secondary minerals growing on the surface include ondrušite, geminite, lavendulan, picropharmacolite and köttigite. Our attention was drawn to the yellow-green transparent crystalline...

... related to geminite, Cu(AsO 3 OH)·H 2 O, and both are indistinguishable in the field. The structural differences between the two are that krupičkaite has a different layer stacking pattern with sheets having a wavy topology. Another related mineral to krupičkaite is slavkovite, which is a highly hydrated...

..., e.g. geminite ( Sejkora et al. , 2010 ), koritnigite ( Frost et al. , 2011 ), haidingerite and brassite ( Frost et al. , 2010a ) or pharmacolite ( Frost et al. , 2010b ). At Jáchymov, the predominant supergene minerals of nickel ( Ondruš et al. , 1997a ) are annabergite and other Ni-containg...

... arsenates geminite, Cu(AsO 3 OH)·H 2 O, yvonite, Cu(AsO 3 OH)·2H 2 O, and lindackerite, (Cu,Co,Ni)Cu 4 (AsO 4 ) 2 (AsO 3 OH) 2 ·9H 2 O. The blocks [Mn 2 (OH) 2 (AsO 4 ) 2 ] ∞∞ found in långbanshyttanite can be compared. with heteropolyhedral layers of tsumcorite and tsumcorite-type minerals and compounds...

... Hloušek *E-mail: [email protected] Chemically and structurally close to geminite Monoclinic: P 2 1 / n ; structure determined a  = 15.504(7), b  = 18.144(7), c  = 10.563(5) Å, β = 103.30(4)° 9.089(100), 4.394(0.5), 3.909(0.5), 3.533(1.0), 3.369(0.5), 3.244(0.4), 2.972(0.9), 2.937(0.5...

... species (camerolaite, capgaronnite, deloryite, geminite, guarinoite, iltisite, mahnertite, perroudite, pradetite, pushcharovskite, theresemagnanite, and zdenekite), and was the subject of two PhD studies ( Guillemin, 1952 ; Chiappero, 1993 ). The latter introduced a systematic numbering of the pillars...

...), γ = 98.401(2)°, D meas = 3.35, D calc = 3.235 g/cm 3 for Z = 32. The ideal formula is CuAsO 3 (OH)·1.5H 2 O. Strongest lines of the powder pattern are 18.30(25,001), 11.00(100,1&1̅0), 5.79(15,1&1̅3), 3.878(20,032), and 3.389(15,033). The mineral is structurally related to geminite...

... (Oshikoto) region, Namibia. It is associated with stranskiite, geminite, adamite–olivenite and calcioandyrobertsite, and is thought to have originated on the 4400-foot level of the mine in an area known as the third oxidation zone. F ig . 1. The Raman spectrum of davidlloydite. X-ray powder...

... – 1276 . Plumhoff A.M. , Dachs E. , Benisek A. , Plášil J. , Sejkora J. , Števko M. , Rumsey M.S. and Majzlan J. ( 2020 ) Thermodynamic properties, crystal structure and phase relations of pushcharovskite Cu(AsO 3 OH)(H 2 O)⋅0.5H 2 O, geminite Cu(AsO 3 OH...