Hloušekite, (Ni,Co)Cu4(AsO4)2(AsO3OH)2(H2O)9, a new member of the lindackerite supergroup from Jáchymov, Czech Republic
Hloušekite, (Ni,Co)Cu4(AsO4)2(AsO3OH)2(H2O)9, a new member of the lindackerite supergroup from Jáchymov, Czech Republic
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Hloušekite，(Ni,Co)Cu4(AsO4)2(AsO3OH)2(H2O)9，来自捷克共和国 Jáchymov 的锇铁矿超群的新成员
作者：
J. Plášil;J. Sejkora;R. Škoda;Milan Novák;A. Kasatkin;P. Škácha;F. Veselovský;K. Fejfarová;P. Ondruš
Hloušekite, (Ni,Co)Cu4(AsO4)2(AsO3OH)2(H2O)9，是一种新的表生砷酸盐矿物，产自捷克西波西米亚Jáchymov （St Joachimsthal）的Geister脉（Rovnost矿）。在强蚀变的矿石碎块表面，与黄钨矿、黄铜矿为主的黄钨矿、黄钨矿、黄铜矿、黄铜矿、veselovskýite和石膏一起被发现。Hloušekite形成薄的板条状晶体，局部拉长可达3毫米。它是透明的，有一个淡绿色的玻璃光泽，有一个灰白色的条纹，它是非常脆，不均匀的断裂。它在短波或长波紫外线辐射下不会发出荧光。{010}上的乳沟是完美的；莫氏硬度为2-3。计算密度为3.295 g cm-3。Hloušekite是光学双轴与α ' = 1.653(2)和γ ' = 1.73。估计的光学取向为γ′与伸长率(c) = 14(1)°。在较大的颗粒中，它是弱到中度多色性的（α =无色，β =淡绿色到绿色）。Hloušekite为三斜，空间群P1， 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)°，V = 521.23（10） Å3，其中Z = 1, a:b:c = 0.80:1:1.299。粉末x射线衍射（XRD）图谱[d]中Å (I)（hkl）的8条最强谱线分别为10.211(100)（001）、7.974(9)（010）、3.984(6)（020）、3.656(5)（11）、3.631(5)（02）、3.241(5)（022）、3.145(5)（200）和3.006(5)（210）。经电子探针化学分析，MgO为0.20，FeO为0.10，NiO为5.79，CoO为1.80，CuO为29.53，ZnO为0.66，Al2O3为0.14，P2O5为0.11，As2O5为45.01，H2O为17.71 (calc.)，总wt.%为101.05。根据晶体结构，通过化学计量学（9H2O + 2OH）计算得到的经验公式为（Ni0.79Co0.25）Σ1.04(Cu3.78Zn0.08Mg0.05Al0.03Fe0.01) s395 (AsO4)1.98(PO4)0.02(AsO3OH)2.00(H2O)9.00。理想的端元配方NiCu4(AsO4)2(AsO3OH)2(H2O)9.00，要求NiO 7.23, CuO 30.81, As2O5 44.51, H2O 17.45，总wt.%为100.00。利用单晶XRD数据对hloušekite的晶体结构进行了电荷翻转求解，在[Iobs > 3σ(I)]反射1441次后，将其细化为R1 = 0.0599。Hloušekite是林达灰石超组林达灰石组（也包括林达灰石、pradetite和veselovský ite）的新成员。林达辉石超群中的ondrušite组包括ondrušite、丘多白石、盖革石和克拉杰石。这两个基团的建立反映了其成员晶体结构的差异，主要是在Me阳离子的配位环境中。
Abstract 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 veselovskýite, 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, β = pale green to green). Hloušekite is triclinic, space group P1̅, 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)(11̅2), 3.631(5)(02̅1), 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 (9H2O + 2OH), obtained from the crystal structure, is (Ni0.79Co0.25)Σ1.04(Cu3.78Zn0.08Mg0.05Al0.03Fe0.01)S3.95 (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 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.