Mineral Information and Data:

Jaffeite
Ca6Si2O7(OH)6 [CNMNC approved formula]

Named for Howard Jaffe of the University of Massachusetts.

IMA status : Approved Species 1989 ()
CLASSIFICATION 
Dana
(8th edition) :
55.03.02.01  
  (55) Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.03) with cations in [7] coordination
  (55.03.02)
  
Nickel-Strunz
(10th edition) :
09.BE.12
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BE) Si2O7 groups, with additional anions; cations in octahedral [6] and greater coordination
  
Crystal system: Trigonal System
Point group (H-M): 3 — rhombohedral
  
  
  

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