Niksergievite, [Ba1.33Ca0.67Al(CO3)(OH)4][Al2(AlSi3O10)(OH)2]·nH2O, a new phyllosilicate related to the surite-ferrisurite series
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Sergey P. Saburov
,
Galiya K. Bekenova
Abstract
Niksergievite, [Ba1.33Ca0.67Al(CO3)(OH)4][Al2(AlSi3O10)(OH)2]·nH2O, is a new phyllosilicate closely related to the surite-ferrisurite series. It was found at the .400 m level of the Tekeli Pb-Zn mine, southeast Kazakhstan (44° N, 78° E). The mineral occurs as curved plates 3.5 mm in size forming rosette-like aggregates up to 5 cm across. Associated minerals include calcite, quartz, dolomite, celsian, sphalerite, pyrite, barite, and montmorillonite. Niksergievite is white with a light greenish tint and pearly luster on cleavage planes. The streak is white and the mineral is non-fluorescent. The Mohs hardness is 1.11/2. The cleavage is perfect (mica-like) on {001}. Dm = 3.16 g/cm3 and Dx = 3.21 g/cm3. The IR spectrum shows the following peaks (* shoulder): 3665*, 3640, 3405, 1630, 1454, 1105*, 1080*, 1035, 1020*, 980*, 960*, 920*, 876, 835*, 750*, 704, 625*, 560*, 535, 474, and 417 cm-1. Optically, the mineral is colorless, non-pleochroic, biaxial (-), 2V = 0.10°, α = 1.580(2), β = 1.625(2), γ = 1.625(2), and X ~ c. The chemical composition (electron microprobe, CO2 and H2O by TGA) is K2O 0.1, CaO 5.1, BaO 27.1, MgO 0.4, FeO 0.2, Al2O3 24.8, SiO2 28.7, CO2 6.1, and H2O 8.3, with a total of 100.8 wt%. The empirical formula based on (Si + Al + Mg + Fe) = 7 is (Ba1.27Ca0.65K0.02)1.92(Al3.49Si3.42Mg0.07Fe2+0.02)7.00O10.00(CO3)0.99(OH)6.20·0.20H2O. The simplified formula is (Ba,Ca)2(Al,Si)7O10(CO3)(OH)6·nH2O and the proposed structural formula is [Ba1.33Ca0.67Al(CO3)(OH)4][Al2(AlSi3O10)(OH)2]·nH2O. The mineral is monoclinic, C2/c, C2, or Cm, a 5.176(3), b 8.989(3), c 16.166(5) Å, β 96.44(6)°, V 747.4(9) Å3, Z = 2. The strongest reflections in the X-ray powder diffraction pattern are as follows [d in Å, (I) (hkl)]: 16.1(40)(001), 4.49(90)(020), 3.68(60)(014,1̄13), 2.585(100)(130,2̅01, 1̄31), 2.230(90)(1.34,220), 2.069(80)(043), 1.692(60)(3.11,1̄51,240). It is named in honor of Prof. Nikolai Grigorievich Sergiev (1901.1960) for his contributions to the geology of Kazakhstan.
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- A synthesis of systematic mineralogy
- Oxidation/alteration of pentlandite and pyrrhotite surfaces at pH 9.3: Part 1. Assignment of XPS spectra and chemical trends
- Oxidation of pentlandite and pyrrhotite surfaces at pH 9.3: Part 2. Effect of xanthates and dissolved oxygen
- X-ray Rietveld refinement and FTIR spectra of synthetic (Si,Ge)-richterites
- Influence of crystal chemistry on ideal plastic shear anisotropy in forsterite: First principle calculations
- High-temperature Mössbauer study of Fe-substituted mullite
- Pressure and temperature-dependence of water solubility in Fe-free wadsleyite
- Quartz exsolution in clinopyroxene is not proof of ultrahigh pressures: Evidence from eclogites from the Eastern Blue Ridge, Southern Appalachians, U.S.A.
- The visible and infrared spectral properties of jarosite and alunite
- Wakabayashilite, [(As,Sb)6S9][As4S5]: Crystal structure, pseudosymmetry, twinning, and revised chemical formula
- Compression of albite, NaAlSi3O8
- Effect of polymorphic transition on oxygen isotope fractionation between aragonite, calcite, and water: A low-temperature experimental study
- Effect of current density on the electron microprobe analysis of alkali aluminosilicate glasses
- A high-pressure polytypic transformation in type-I chlorite
- Experimental determination of crystal growth rates in highly supercooled aluminosilicate liquids: Implications for rate-controlling processes
- P-V equation of State, thermal expansion, and P-T stability of synthetic zincochromite (ZnCr2O4 spinel)
- Niksergievite, [Ba1.33Ca0.67Al(CO3)(OH)4][Al2(AlSi3O10)(OH)2]·nH2O, a new phyllosilicate related to the surite-ferrisurite series
- The crystal-chemistry of holmquistites: Ferroholmquistite from Greenbushes (Western Australia) and hints for compositional constraints in BLi amphiboles
- Dissakisite-(La) from the Ulten zone peridotite (Italian Eastern Alps): A new end-member of the epidote group
- Mazzite-Na, a new zeolite from Boron, California: Its description and crystal structure
- Low-temperature illitization of smectite in the late eocene and early oligocene of the Isle of Wight (Hampshire basin), U.K.
- First reported sedimentary occurrence of berlinite (AlPO4) in phosphate-bearing sediments from Cioclovina Cave, RomaniaComment
- Optical and near infrared spectra of ringwoodite to 21.5 GPa: Implications for radiative heat transport in the mantle
- Letter. Observation of nano-clustered calcite growth via a transient phase mediated by organic polyanions: A close match for biomineralization
- Letter. Aluminum coordination and the densification of high-pressure aluminosilicate glasses
- Letter. Crystal chemistry of a high-pressure C2/c clinopyroxene with six-coordinated silicon
