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Hlousekite, (Ni,Co)Cu (sub 4) (AsO (sub 4) ) (sub 2) (AsO (sub 3) OH) (sub 2) (H (sub 2) O) (sub 9) ; a new member of the lindackerite supergroup from Jachymov, Czech Republic

J. Plasil, J. Sejkora, R. Skoda, M. Novak, A. V. Kasatkin, P. Skacha, F. Veselovsky, K. Fejfarova and P. Ondrus
Hlousekite, (Ni,Co)Cu (sub 4) (AsO (sub 4) ) (sub 2) (AsO (sub 3) OH) (sub 2) (H (sub 2) O) (sub 9) ; a new member of the lindackerite supergroup from Jachymov, Czech Republic
Mineralogical Magazine (October 2014) 78 (5): 1341-1353

Abstract

Hlousekite, (Ni,Co)Cu (sub 4) (AsO (sub 4) ) (sub 2) (AsO (sub 3) OH) (sub 2) (H (sub 2) O) (sub 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. Hlousekite 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 (super -3) . Hlousekite 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 P1, a=6.4010(6), b=8.0041(6), c=10.3969(14) Aa, alpha =85.824(8), beta =79.873(9), gamma =84.655(7) degrees and V=521.23(10) Aa (super 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 Aa (I)(hkl)] are 10.211(100)(001), 7.974(9)(010), 3.984(6)(020), 3.656(5)(112), 3.631(5)(021), 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, Al (sub 2) O (sub 3) 0.14, P (sub 2) O (sub 5) 0.11, As (sub 2) O (sub 5) 45.01, H (sub 2) O 17.71 (calc.), for a total of 101.05 wt.%. The resulting empirical formula, calculated by stoichiometry (9H (sub 2) O+2OH), obtained from the crystal structure, is (Ni (sub 0.79) Co (sub 0.25) ) (sub Sigma 1.04) (Cu (sub 3.78) Zn (sub 0.08) Mg (sub 0.05) Al (sub 0.03) Fe (sub 0.01) ) (sub Sigma 3.95) (AsO (sub 4) ) (sub 1.98) (PO (sub 4) ) (sub 0.02) (AsO (sub 3) OH) (sub 2.00) (H (sub 2) O) (sub 9.00) . The ideal endmember formula, NiCu (sub 4) (AsO (sub 4) ) (sub 2) (AsO (sub 3) OH) (sub 2) (H (sub 2) O) (sub 9.00) , requires NiO 7.23, CuO 30.81, As (sub 2) O (sub 5) 44.51, H (sub 2) O 17.45, total 100.00 wt.%. The crystal structure of hlousekite was solved by charge flipping from single-crystal XRD data and refined to R1=0.0599 for 1441 reflections with [I (sub obs) >3sigma (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 ondrusite, 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.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 78
Serial Issue: 5
Title: Hlousekite, (Ni,Co)Cu (sub 4) (AsO (sub 4) ) (sub 2) (AsO (sub 3) OH) (sub 2) (H (sub 2) O) (sub 9) ; a new member of the lindackerite supergroup from Jachymov, Czech Republic
Affiliation: Academy of Sciences of the Czech Republic, Institute of Physics, Prague, Czech Republic
Pages: 1341-1353
Published: 201410
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 42
Accession Number: 2016-016580
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
N50°22'00" - N50°22'00", E12°55'00" - E12°55'00"
Secondary Affiliation: National Museum, CZE, Czech RepublicMasaryk University, CZE, Czech RepublicAlmazjuvelirexport, RUS, Russian FederationCzech Geological Survey, CZE, Czech Republic
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201609
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