Paraershovite, Na3K3Fe3+2 (Si4O10OH)2(OH)2(H2O)4, a new mineral species from the Khibina alkaline massif, Kola peninsula, Russia: description and crystal structure. (Articolo in rivista)

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  • Paraershovite, Na3K3Fe3+2 (Si4O10OH)2(OH)2(H2O)4, a new mineral species from the Khibina alkaline massif, Kola peninsula, Russia: description and crystal structure. (Articolo in rivista) (literal)
Anno
  • 2010-01-01T00:00:00+01:00 (literal)
Alternative label
  • Khomyakov A.; Camara F.; Sokolova E.; Abdu Y.; Hawthorne F. (2010)
    Paraershovite, Na3K3Fe3+2 (Si4O10OH)2(OH)2(H2O)4, a new mineral species from the Khibina alkaline massif, Kola peninsula, Russia: description and crystal structure.
    in Canadian mineralogist
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Khomyakov A.; Camara F.; Sokolova E.; Abdu Y.; Hawthorne F. (literal)
Pagina inizio
  • 279 (literal)
Pagina fine
  • 290 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 48 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • In: Canadian Mineralogist, vol. 48 (2) pp. 279 - 290. Mineralogical Association of Canada, 2010. (literal)
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • Paraershovite, Na3K3Fe3+2 (Si4O10OH)2(OH)2(H2O)4, a new mineral species from the Khibina alkaline massif, Kola peninsula, Russia: description and crystal structure. (literal)
Abstract
  • Paraershovite, Na3K3Fe3+2 (Si4O10OH)2(OH)2(H2O)4, is a new silicate mineral species discovered in a hyperagpaitic pegmatite from Mount Yukspor, Khibina alkaline massif, Kola Peninsula, Russia. The mineral occurs as equant (100) platy and [001] elongate prismatic crystals up to 0.5-1 mm and aggregates up to 2-3 mm sporadically scattered in a pegmatite matrix. Associated minerals are sodalite, aegirine, arfvedsonite, pectolite, shcherbakovite, lamprophyllite, lomonosovite, shafranovskite, villiaumite and natrophosphate. Crystals of paraershovite are yellow with orange or pinkish shades, with a white streak and vitreous luster. The mineral is translucent or transparent, and non-fluorescent under 240-400 nm ultraviolet radiation. Paraershovite has a perfect {100} cleavage. It is brittle, has a step-like and splintery fracture, and a Mohs hardness of 3. Its observed and calculated densities (g/cm3) are 2.60(3) (by microvolumetric methods) and 2.584 (using the empirical formula), respectively. It is biaxial positive, with 1.569(2), β 1.583(2), 1.602(2), 2V(meas.) = 80(3)°, 2V(calc.) = 82°, non-pleochroic, dispersion r v (weak), with X c = 84°, Y c = 66°, Z c = 24°. Paraershovite is triclinic, space group P, a 10.1978(5), b 12.0155(6), c 5.2263(3) Å, 103.439(1), β 96.020(1), 91.683(1)°, V 618.46(3) Å3, Z = 1. The strongest lines in the X-ray powder-diffraction pattern [d in Å(I)(hkl)] are: 11.778(100)(010), 4.390(70)(11, 01), 3.012(70)(230, 20), 2.606(70)(31, 131, 02, 2), 4.109(60)(11, 1) and 2.730(60)(1, 1, 11, 31, 221). A chemical analysis with an electron microprobe gave Na2O 7.77, MgO 0.24, SiO2 49.67, Al2O3 0.58, K2O 14.07, Fe2O3 11.29, MnO 0.73, TiO2 3.32, F 0.39, H2O 10.98, O = F -0.16, sum 98.88 wt.%; the valence state of Fe was determined by Mössbauer spectroscopy, and the amount of H2O was calculated from the crystal-structure refinement. The empirical formula based on 28 anions is (Na2.441.56)4K2.91 (Fe3+1.38Ti0.40Al0.11Mn2+0.10 Mg0.06)2.05Si8.05O20 [ (literal)
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