PLÁŠIL, Jakub, Jiří SEJKORA, Radek ŠKODA, Milan NOVÁK, Anatoly V KASATKIN, Pavel ŠKACHA, František VESELOVSKY, Kristýna FEJFAROVÁ and Petr ONDRUŠ. Hloušekite, (Ni,Co)Cu-4(AsO4)(2)(AsO3OH)(2)(H2O)(9), a new member of the lindackerite supergroup from Jachymov, Czech Republic. Mineralogical Magazine. London: Mineralogical Society, 2014, vol. 78, No 5, p. 1341-1353. ISSN 0026-461X. Available from: https://dx.doi.org/10.1180/minmag.2014.078.5.16.
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Basic information
Original name Hloušekite, (Ni,Co)Cu-4(AsO4)(2)(AsO3OH)(2)(H2O)(9), a new member of the lindackerite supergroup from Jachymov, Czech Republic
Authors PLÁŠIL, Jakub (203 Czech Republic, guarantor), Jiří SEJKORA (203 Czech Republic), Radek ŠKODA (203 Czech Republic, belonging to the institution), Milan NOVÁK (203 Czech Republic, belonging to the institution), Anatoly V KASATKIN (643 Russian Federation), Pavel ŠKACHA (203 Czech Republic), František VESELOVSKY (203 Czech Republic), Kristýna FEJFAROVÁ (203 Czech Republic) and Petr ONDRUŠ (203 Czech Republic).
Edition Mineralogical Magazine, London, Mineralogical Society, 2014, 0026-461X.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10500 1.5. Earth and related environmental sciences
Country of publisher United Kingdom of Great Britain and Northern Ireland
Confidentiality degree is not subject to a state or trade secret
Impact factor Impact factor: 2.026
RIV identification code RIV/00216224:14310/14:00079323
Organization unit Faculty of Science
Doi http://dx.doi.org/10.1180/minmag.2014.078.5.16
UT WoS 000348531400016
Keywords in English hloušekite; new mineral; arsenate; lindackerite supergroup; lindackerite group; ondrusite group; crystal structure
Tags AKR, rivok
Tags International impact, Reviewed
Changed by Changed by: Ing. Andrea Mikešková, učo 137293. Changed: 8/4/2015 15:25.
Abstract
Hloušekite, (Ni,Co)Cu-4(AsO4)(2)(AsO3OH)(2)(H2O)(9), is a new supergene arsenate mineral from the Geister vein (Rovnost mine), Jachymov (St Joachimsthal), Western Bohemia, Czech Republic. It was found along with veselovskyite, pradetite, lavendulan, arsenolite, babanekite and gypsum on the surface of strongly altered ore fragments containing dominant tennantite and chalcopyrite. Hlous. ekite forms thin, lath-like crystals, locally elongated reaching up to 3 mm across. It is transparent, has a pale green colour with vitreous lustre, has a greyish-white streak and it is very brittle with an uneven fracture. It does not fluoresce under shortwave or longwave ultraviolet radiation. Cleavage on {010} is perfect; the Mohs hardness is 2-3. The calculated density is 3.295 g cm(-3). Hlous. ekite is optically biaxial with alpha' = 1.653(2) and gamma' = 1.73. The estimated optical orientation is gamma' vs. elongation (c) = 14(1)degrees. In larger grains it is weakly to moderately pleochroic (alpha = colourless, gamma = pale green to green). Hlousekite is triclinic, space group P (1) over bar, a = 6.4010(6), b = 8.0041(6), c = 10.3969(14) angstrom, alpha = 85.824(8), beta = 79.873(9), gamma = 84.655(7)degrees and V = 521.23(10) angstrom(3), with Z = 1, a:b:c = 0.800: 1: 1.299. The eight strongest lines in the powder X-ray diffraction (XRD) pattern [ d in angstrom (I)(hkl)] are 10.211(100)(001), 7.974(9)(010), 3.984(6)(020), 3.656(5)(1 (1) over bar2), 3.631(5)(0 (2) over bar1), 3.241(5)(022), 3.145(5)(200) and 3.006(5)(210). Chemical analysis by electron microprobe yielded MgO 0.20, FeO 0.10, NiO 5.79, CoO 1.80, CuO 29.53, ZnO 0.66, Al2O3 0.14, P2O5 0.11, As2O5 45.01, H2O 17.71 (calc.), for a total of 101.05 wt.%. The resulting empirical formula, calculated by stoichiometry (9H(2)O + 2OH), obtained from the crystal structure, is (Ni0.79Co0.25)(Sigma 1.04)(Cu3.78Zn0.08Mg0.05Al0.03Fe0.01)(Sigma 3.95) (AsO4)(1. 98)(PO4)(0.02)(AsO3OH)(2.00)(H2O)(9.00). The ideal endmember formula, NiCu4(AsO4)(2)(AsO3OH)(2)(H2O)(9.00), requires NiO 7.23, CuO 30.81, As2O5 44.51, H2O 17.45, total 100.00 wt.%. The crystal structure of hlous. ekite was solved by charge flipping from single-crystal XRD data and refined to R-1 = 0.0599 for 1441 reflections with [I-obs > 3 sigma(I)]. Hlousekite is a new member of the lindackerite group (also including lindackerite, pradetite and veselovskyite) of the lindackerite supergroup. The ondrusite group of the lindackerite supergroup includes ondrus. ite, chudobaite, geigerite and klajite. The establishment of these two groups reflects the difference between the crystal structures of their members, mainly in the coordination environment of the Me cations.
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