Mineral Information and Data:

Jeffreyite
(Ca,Na)2(Be,Al)Si2(O,OH)7 [CNMNC approved formula]

Named for the locality: Jeffrey mine, Asbestos, Quebec, Canada.

IMA status : Approved Species 1984 ()
CLASSIFICATION 
Dana
(8th edition) :
55.04.02.03  
  (55) Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04) with cations in [8] and lower coordination
  (55.04.02) Fresnoite group
  
Nickel-Strunz
(10th edition) :
09.BB.10
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BB) Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
  
Crystal system: Orthorhombic System
Point group (H-M): 222 — disphenoidal
  
  
  

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