title: Chirvinskyite, (Na,Ca)13(Fe,Mn,□)2(Ti,Nb)2(Zr,Ti)3(Si2O7)4(OH,O,F)12, a new mineral with a modular wallpaper structure, from the Khibiny alkaline massif (Kola Peninsula, Russia)
metadata.name: dc.date.accessioned
metadata.value: 2020-09-09T07:36:22Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2020-09-09T07:36:22Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2019
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/19313
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: Chirvinskyite, (Na,Ca)13(Fe,Mn, )2(Ti,Nb)2(Zr,Ti)3(Si2O7)4(OH,O,F)12, is a new wöhlerite–
  related zirconotitano–sorosilicate. It is triclinic, P 1, a = 7.0477(5), b = 9.8725(5), c = 12.2204(9) Å,
    = 77.995(5),   = 82.057(6), 
   = 89.988(5) , V = 823.35(9) Å3, Z = 1. The mineral was found in
  albitized alkaline pegmatites in a foyaite of the Mt. Takhtarvumchorr (Khibiny alkaline massif,
  Kola Peninsula, Russia, N 67 400, E 33 330). Chirvinskyite forms sheaf–like and radiated aggregates
  (up to 6 mm in diameter) of split fibrous crystals hosted by saccharoidal fluorapatite and albite.
  The mineral is pale cream in color, with a silky luster and a white streak. The cleavage is not
  recognized. Mohs hardness is 5. Chirvinskyite is biaxial (–),   1.670(2),   1.690(2), 
   1.705(2) (589 nm),
  2Vcalc = 80.9 . The calculated and measured densities are 3.41 and 3.07(2) g cm􀀀3, respectively.
  The empirical formula based on Si = 8 apfu is (Na9.81Ca3.28K0.01)P
  13.10(Fe0.72Mn0.69 0.54Mg0.05)P
  2.00
  (Ti1.81Nb0.19)P
  2.00(Zr2.27Ti0.63)P
  2.90(Si2O7)4{(OH)5.94O3.09F2.97}P
  12.00. Chirvinskyite belongs to a new
  structure type of minerals and inorganic compounds and is related to the wöhlerite-group minerals.
  Its modular “wallpaper” structure consists of disilicate groups Si2O7 and three types of “octahedral
  walls”. The mineral is named in honor of Petr Nikolaevich Chirvinsky (1880–1955), Russian geologist
  and petrographer, head of the Petrography Department of the Perm’ State University (1943–1953),
  for his contributions to mineralogy and petrology, including studies of the Khibiny alkaline massif.
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Chirvinskyite, (Na,Ca)13(Fe,Mn,□)2(Ti,Nb)2(Zr,Ti)3(Si2O7)4(OH,O,F)12, a new mineral with a modular wallpaper structure, from the Khibiny alkaline massif (Kola Peninsula, Russia)
metadata.lang: en_GB
resources.filename: 11.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/19313/1/11.pdf
resources.format: Adobe PDF
resources.size: 7,32 MB