Mineral Information and Data:

Dellaite
Ca6(Si2O7)(SiO4)(OH)2 [CNMNC approved formula]

Named for Della Martin Roy (1926-), Pennsylvania State University geochemist who first synthesized this phase.

IMA status : Approved Species 1965 ()
CLASSIFICATION 
Dana
(8th edition) :
78.01.04.01  
  (78) Unclassified silicates
  (78.01) possible nesosilicates
  (78.01.04)
  
Nickel-Strunz
(10th edition) :
09.BG.45
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BG) Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
  
  
  

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