Mineral Information and Data:

Sillenite
Bi12SiO20 [CNMNC approved formula]

Named .

IMA status : Valid species (Pre-IMA 1943) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
04.03.12.01  
  (04) Simple Oxides
  (04.03) with a cation charge of 3+ (A+++2 O3)
  (04.03.12)
  
Nickel-Strunz
(10th edition) :
04.CB.70
  (04) Oxides and Hydroxides
  (04.C) Metal:Oxygen = 2:3, 3:5, and Similar
  (04.CB) With medium-sized cations
  
Crystal system: Cubic System
Point group (H-M): 23 — tetartoidal
  
  
  

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