Mineral Information and Data:

Bentorite
Ca6Cr2(SO4)3(OH)12 • 26H2O [CNMNC approved formula]

Named for Y.K. Bentor, Professor at the University of California, San Diego, California, USA, for his contributions to geology and mineralogy in Israel.

IMA status : Approved Species 1980 ()
CLASSIFICATION 
Dana
(8th edition) :
31.10.02.02  
  (31) Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.10) miscellaneous
  (31.10.02)
  
Nickel-Strunz
(10th edition) :
07.DG.15
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.D) Sulfates (selenates, etc.) with additional anions, with H2O
  (07.DG) With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
  
Crystal system: Hexagonal System
Point group (H-M): 6/mmm (or 6/m 2/m 2/m) — dihexagonal-dipyramidal
  
  
  

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