Jinshajiangite

Jinshajiangite
General
Category Sorosilicate
Formula
(repeating unit)		 BaNaFe4Ti2(Si2O7)2O2(OH)2F
Strunz classification 9.BE.67
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group C2/m
Unit cell a = 10.6785, b = 13.786
c = 20.700 [Å], β = 94.937°
Identification
References [1][2]

Jinshajiangite is a rare silicate mineral named after the Jinshajiang river in China.[3][2] Its currently accepted formula is BaNaFe4Ti2(Si2O7)2O2(OH)2F.[4] It gives a name of the jinshajiangite group.[2] The mineral is associated with alkaline rocks. In jinshajiangite, there is a potassium-to-barium, calcium-to-sodium, manganese-to-iron and iron-to-titanium diadochy substitution. Jinshajiangite is the iron-analogue of surkhobite[4] and perraultite.[5] It is chemically related to bafertisite, cámaraite[2] and emmerichite.[6] Its structure is related to that of bafertisite. Jinshajiangite is a titanosilicate with heteropolyhedral HOH layers, where the H-layer is a mixed tetrahedral-octahedral layer, and the O-layer is simply octahedral.[4]

The mineral has only two known places of natural occurrences; a dyke near Jinshajiang River, Sichuan Province and the intrusion of Norra Kärr in Sweden.[7][4]

References

  1. ↑ Sokolova E, Camara F, Hawthorne F C, Abdu Y (2009). "From structure topology to chemical composition. VII. Titanium silicates: the crystal structure and crystal chemistry of jinshajiangite". European Journal of Mineralogy. 21: 871–883.
  2. 1 2 3 4 Mindat
  3. ↑ Hong, W., and Fu, P., 1982. Jinshajiangite - a new Ba-Mn-Fe-Ti-bearing silicate mineral. Geochemistry 1, 458-464
  4. 1 2 3 4 Rastsvetaeva, R.K.; Chukanov, N.V.; Rozenberg, K.A. (2008). "Crystal Structure of Jinshajiangite from the Norra Kärr Complex (Sweden)" (PDF). Crystallography Reports. 53 (4): 553–556.
  5. ↑ Mindat, Perraultite
  6. ↑ Mindat, Emmerichite
  7. ↑ Holtstam, Dan (1998). "Jinshajiangite from the Norra Kärr alkaline intrusion, Jönköping, Sweden". GFF. 120 (4): 373–374.


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