FRA
Framework Type FRA
Type Material
 Material Name: Franzinite
 Chemical Formula:|(Na,K)+30 Ca2+10 (SO4)2-10 (H2O)2| [Al30Si30 O120]-FRA
 Unit Cell:  
  trigonalP321 (# 150)
  a = 12.916Åb = 12.916Åc = 26.543Å
  α = 90.0 °β = 90.0 °γ = 120.0 °
 Framework density: 15.6 T/1000 Å3
 Channels: apertures formed by 6-rings only (0-dimensional)
  
  
  
 
 
 References:
  Ballirano, P., Bonaccorsi, E., Maras, A. and Merlino, S."The crystal structure of franzinite, the ten-layer mineral of the cancrinite group", Can. Mineral., 38, 657-668 (2000)
Ballirano, P. and Maras, A."Improved powder X-ray data for cancrinites IV: Franzinite", Powder Diffraction, 16, 216-219 (2001)

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