Klajite from Recsk (Hungary), the first Mn-Cu arsenate mineral

Szakáll, Sándor; Fehér, Béla; Bigi, Simona; Mádai, Ferenc

doi:10.1127/0935-1221/2011/0023-2143

Cited by 3 publications

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“…The current single-crystal XRD experiment provided better data, which is reflected by better results of the structure refinement, compared to the ondrušite study (Sejkora et al, 2011). We conclude that klajite should contain 10 instead of 9 molecules of H 2 O as was given in the original description of klajite by Szakáll et al (2011).…”

Section: Discussionmentioning

confidence: 64%

“…1). To the best of our knowledge, Jáchymov thus represents the second world occurrence of this extremely rare mineral after its type locality in Lejtakna, Recsk, Mátra Mts., Hungary (Szakáll et al, 2011).…”

Section: Occurrencementioning

confidence: 99%

“…KLAJITE was described originally by Szakáll et al (2011) from Recsk in Hungary, as a new member of the lindackerite group of minerals. The namebearing member of the group, lindackerite, was described in 1853 by Josef Florian Vogl from the Geister vein in Jáchymov, Bohemia (Vogl, 1853).…”

Section: Introductionmentioning

confidence: 99%

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Klajite, MnCu₄(AsO₄)₂(AsO₃OH)₂(H₂O)₁₀, from Jáchymov (Czech Republic): the second world occurrence

et al. 2014

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Klajite, MnCu4(AsO4)2(AsO3OH)2(H2O)10, the Mn-Cu-bearing member of the lindackerite group, was found in Jáchymov, Czech Republic, as the second world occurrence. It is associated with ondrušite and other arsenate minerals growing on the quartz gangue with disseminated primary sulfides, namely tennantite and chalcopyrite. Electron-microprobe data showed klajite aggregates to be chemically inhomogeneous at larger scales, varying from Mn-Ca-rich to Cu-rich domains. The chemical composition of the the Mn-rich parts of aggregates can be expressed by the empirical formula (Mn0.46Ca0.22Cu0.07Mg0.02)∑0.77(Cu3.82Mg0.14Ca0.03Zn0.01)∑4.00(As1.94Si0.06)∑2.00O8[AsO2.73(OH)1.27]2(H2O)10 (mean of seven representative spots; calculated on the basis of As + Si + P = 4 a.p.f.u. (atoms per formula unit) and 10 H2O from ideal stoichiometry), showing a slight cationic deficiency at the key Me-site. According to single-crystal X-ray diffraction, klajite from Jáchymov is triclinic, P , with a = 6.4298(8), b = 7.9716(8), c = 10.707(2) Å, α = 85.737(12)°, β = 80.994(13)°, γ = 84.982(10)°, and V = 538.85(14) Å3, Z = 1. The crystal structure was refined to R1 = 0.0628 for 1034 unique observed reflections (with Iobs > 3σ(I)), confirming that klajite (Mn-Cu member) and ondrušite (Ca-Cu member) are isostructural. The current data-set allowed determination of the positions of several hydrogen atoms. Discussion on hydrogen bonding networks in the structure of klajite as well as detailed bond-valence analysis are provided.

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Section: Discussionmentioning

confidence: 64%

Section: Occurrencementioning

confidence: 99%

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Klajite, MnCu₄(AsO₄)₂(AsO₃OH)₂(H₂O)₁₀, from Jáchymov (Czech Republic): the second world occurrence

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“…Five of them have the M position (consisting of two sites M1 and M2) occupied fully by Cu. These are lindackerite sensu stricto (Vogl, 1853;Sarp and Dominik, 1995;Hybler et al, 2003), pradetite (Sarp and Dominik, 1995;Burke et al, 2007), veselovskýite (Sejkora et al, 2010), ondrušite (Sejkora et al, 2011b) and klajite (Szakáll et al, 2011). The difference between them lies in the occupation and coordination of the Me site, which is dominated in the abovementioned minerals by Cu, Co, Zn, Ca and Mn, respectively.…”

Section: Introductionmentioning

confidence: 99%

Hloušekite, (Ni,Co)Cu₄(AsO₄)₂(AsO₃OH)₂(H₂O)₉, a new member of the lindackerite supergroup from Jáchymov, Czech Republic

et al. 2014

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Hloušekite, (Ni,Co)Cu4(AsO4)2(AsO3OH)2(H2O)9, is a new supergene arsenate mineral from the Geister vein (Rovnost mine), Jáchymov (St Joachimsthal), Western Bohemia, Czech Republic. It was found along with veselovský ite, pradetite, lavendulan, arsenolite, babánekite and gypsum on the surface of strongly altered ore fragments containing dominant tennantite and chalcopyrite. Hloušekite 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. Hloušekite is optically biaxial with α’ = 1.653(2) and γ’ = 1.73. The estimated optical orientation is γ’ vs. elongation (c) = 14(1)°. In larger grains it is weakly to moderately pleochroic (α = colourless, γ = pale green to green). Hloušekite is triclinic, space group P1̄ , a = 6.4010(6), b = 8.0041(6), c = 10.3969(14) Å , α = 85.824(8), β = 79.873(9), γ = 84.655(7)° and V = 521.23(10) Å3, 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 Å (I)(hkl)] are 10.211(100)(001), 7.974(9)(010), 3.984(6)(020), 3.656(5)(11̄2), 3.631(5)(02̄ 1), 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, CoO1.80, CuO29.53, 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 (9H2O + 2OH), obtained from the crystal structure, is (Ni0.79Co0.25)Σ1.04(Cu3.78Zn0.08Mg0.05Al0.03Fe0.01)Σ3.95 (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 NiO7.23, CuO30.81, As2O5 44.51, H2O17.45, total 100.00 wt.%. The crystal structure of hloušekite was solved by charge flipping from single-crystal XRD data and refined to R1 = 0.0599 for 1441 reflections with [Iobs > 3σ(I)]. Hloušekite is a new member of the lindackerite group (also including lindackerite, pradetite and veselovský ite) of the lindackerite supergroup. The ondrušite group of the lindackerite supergroup includes ondrušite, 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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Parageneses and Crystal Chemistry of Arsenic Minerals

Majzlan

Drahota

Filippi

2014

Reviews in Mineralogy and Geochemistry

100

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Klajite from Recsk (Hungary), the first Mn-Cu arsenate mineral

Cited by 3 publications

References 3 publications

Klajite, MnCu₄(AsO₄)₂(AsO₃OH)₂(H₂O)₁₀, from Jáchymov (Czech Republic): the second world occurrence

Klajite, MnCu₄(AsO₄)₂(AsO₃OH)₂(H₂O)₁₀, from Jáchymov (Czech Republic): the second world occurrence

Hloušekite, (Ni,Co)Cu₄(AsO₄)₂(AsO₃OH)₂(H₂O)₉, a new member of the lindackerite supergroup from Jáchymov, Czech Republic

Parageneses and Crystal Chemistry of Arsenic Minerals

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Klajite from Recsk (Hungary), the first Mn-Cu arsenate mineral

Cited by 3 publications

References 3 publications

Klajite, MnCu4(AsO4)2(AsO3OH)2(H2O)10, from Jáchymov (Czech Republic): the second world occurrence

Klajite, MnCu4(AsO4)2(AsO3OH)2(H2O)10, from Jáchymov (Czech Republic): the second world occurrence

Hloušekite, (Ni,Co)Cu4(AsO4)2(AsO3OH)2(H2O)9, a new member of the lindackerite supergroup from Jáchymov, Czech Republic

Parageneses and Crystal Chemistry of Arsenic Minerals

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Klajite, MnCu₄(AsO₄)₂(AsO₃OH)₂(H₂O)₁₀, from Jáchymov (Czech Republic): the second world occurrence

Klajite, MnCu₄(AsO₄)₂(AsO₃OH)₂(H₂O)₁₀, from Jáchymov (Czech Republic): the second world occurrence

Hloušekite, (Ni,Co)Cu₄(AsO₄)₂(AsO₃OH)₂(H₂O)₉, a new member of the lindackerite supergroup from Jáchymov, Czech Republic