Whiteite-(CaMnMn), CaMnMn2Al2[PO4]4(OH)2•8H2O, a new mineral from the Hagendorf-Sud granitic pegmatite, Germany

被引:11
|
作者
Yakovenchuk, V. N. [1 ]
Keck, E.
Krivovichev, S. V. [1 ,2 ]
Pakhomovsky, Y. A. [1 ]
Selivanova, E. A. [1 ]
Mikhailova, J. A. [1 ]
Chernyatieva, A. P. [2 ]
Ivanyuk, G. Yu. [1 ]
机构
[1] Russian Acad Sci, Kola Sci Ctr, Nanomat Res Ctr, Apatity 184200, Murmansk Region, Russia
[2] St Petersburg State Univ, Dept Crystallog, St Petersburg 199034, Russia
关键词
whiteite-(CaMnMn); new mineral; whiteite group; granitic pegmatite; Hagendorf-Sud; Germany; CRYSTAL-STRUCTURE; SOUTH-DAKOTA; WHITEITE; JAHNSITE; BAVARIA; CUSTER;
D O I
10.1180/minmag.2012.076.7.09
中图分类号
P57 [矿物学];
学科分类号
070901 ;
摘要
Whiteite-(CaMnMn), CaMnMn2Al2[PO4](4)(OH)(2)center dot 8H(2)O, is a new hydrous phosphate of Ca, Mn and Al, which is closely related to both jahnsite-(CaMnMn) and the minerals of the whiteite group. It is monoclinic, P2/a, with a = 15.02(2), b = 6.95(1), c = 10.13(3) angstrom, beta = 111.6(1)degrees, V = 983.3(6) angstrom(3), Z = 2 (from powder diffraction data) or a = 15.020(5), b = 6.959(2), c = 10.237(3) angstrom, beta = 111.740(4)degrees, V = 984.3(5) angstrom(3), Z = 2 (from single-crystal diffraction data). The mineral was found in the Hagendorf Sud granitic pegmatite (Germany) as small (up to 0.5 mm in size) crystals elongated on a and tabular on {010}. The crystals are either simply or polysynthetically twinned on {001}. They crystallize on the walls of voids within altered zwieselite crystals or form coronas (up to 1 mm in diameter) around cubic crystals of uraninite. The mineral is transparent, colourless to pale yellow (depending on Al-Fe3+ substitution), with a vitreous lustre and a white streak. The cleavage is perfect on {001}, the fracture is stepped and the Mohs hardness is 3 1/2. In transmitted light, the mineral is colourless; dispersion was not observed. Whiteite-(CaMnMn) is biaxial (+), alpha = 1.589(2), beta = 1.592(2), gamma = 1.601(2) (589 nm), 2V(meas) = 60(10)degrees, 2V(calc) = 60.3 degrees. The optical orientation is X = b, Z boolean AND a = 5 degrees. The calculated and measured densities are D-calc = 2.768 and D-meas = 2.70(3) g cm(-3), respectively. The mean chemical composition determined by electron microprobe is Na2O 0.53, MgO 0.88, Al2O3 11.66, P2O5 34.58, CaO 4.29, MnO 17.32, FeO 8.32, ZnO 2.60 wt.%, with H2O 19.50 wt.% (determined by the Penfield method), giving a total of 99.68 wt.%. The empirical formula calculated on the basis of four phosphorus atoms per formula unit, with ferric iron calculated to maintain charge balance, is (Ca0.63Zn0.26Na0.14)(Sigma 1.03) (Mn0.60Fe0.402+)(Sigma 1.00)(Mn1.40Fe0.372+Mg0.18Fe0.063+)(Sigma 2.01)(Al1.88Fe0.123+)(Sigma 2.00)[PO4](4)(OH)(2)center dot 7.89H(2)O. The simplified formula is CaMnMn2Al2[PO4](4)(OH)(2)center dot 8H(2)O. The mineral is easily soluble in 10% HCl at room temperature. The strongest X-ray powder-diffraction lines [listed as d in angstrom (I) (hkl)] are as follows: 9.443(65)(001), 5.596(25)(011), 4.929(80)(210), 4.719(47)(002), 3.494(46)(400), 2.7958(100)(022). The crystal structure of whiteite-(CaMnMn) was refined for a single crystal twinned on (001) to R-1 = 0.068 on the basis of 5702 unique observed reflections. It is similar to the structures of other members of the whiteite group. The mineral is named for the chemical composition, in accordance with whiteite-group nomenclature.
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页码:2761 / 2771
页数:11
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