Mineral Information and Data:

Keldyshite
Na2ZrSi2O7 [CNMNC approved formula]

Named for Mstislav Vsevolodovich Keldysh (1911-1978), Russian mathematician and President of the Academy of Sciences, Russia.

IMA status : Approved Species 1962 ()
CLASSIFICATION 
Dana
(8th edition) :
55.02.02.01  
  (55) Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.02) with cations in [6] coordination
  (55.02.02) Keldyshite group
  
Nickel-Strunz
(10th edition) :
09.BC.10
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BC) Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
  
  
  

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