... 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...

... for the minerals of the krautite group.   log K a   Δ f H°  S°  Δ f S°  Δ f G°    kJ⋅mol –1   J⋅mol –1 ⋅K –1   J⋅mol –1 ⋅K –1   kJ⋅mol –1   Geminite –6.99 b         Cu[AsO 3 (OH)]⋅H 2 O           Krautite –6.10 –1392.2 178.1 –598.5 –1213.8 Mn[AsO 3 (OH)]⋅H 2 O...

... 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...

... 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...

... type, it has no natural or synthetic analogues. Topologically, heteropolyhedral blocks 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...

.... , 2011 ). The studied sample represents a 6 cm × 4 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...

... 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...

... minerals known from this ore district, 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...

... heteropolyhedral block coplanar to (001). Topologically, heteropolyhedral blocks in långbanshyttanite are close to that found in the structures of the copper 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...

... ⋅8H 2 O Geister vein, 3rd Geister level of the Rovnost (Werner) mine, Jáchymov, Western Bohemia, Czech Republic (50°22’08”N, 12°53’49”E) Gwladys Steciuk, Jakub Plášil*, Jiří Sejkora, Jiří Čejka and Jan Hloušek *E-mail: plasil@fzu.cz Chemically and structurally close to geminite...

...: beudantite, carminite, duftite, mimetite, and scorodite in the Fe/Pb area, and olivenite and lavendulan in the Cu area ( Fig. 2 ). Cap Garonne is the type locality for 12 species (camerolaite, capgaronnite, deloryite, geminite, guarinoite, iltisite, mahnertite, perroudite, pradetite, pushcharovskite...

... = 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, yvonite, and fluckite. J.L.J. * Before publication, minerals...

... – 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...