Mineral Information and Data:

Delhayelite
K7Na3Ca5Al2Si14O38F4Cl2 [CNMNC approved formula]

Named for Fernard Delhaye (1880-1946), Belgian geologist, a pioneer in the geological exploration of the northern Kivu region of Zaire.

IMA status : Approved Species 1959 ()
CLASSIFICATION 
Dana
(8th edition) :
72.05.01.04  
  (72) Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.05) with corrugated and complex layers
  (72.05.01) Rhodesite group
  
Nickel-Strunz
(10th edition) :
09.EB.10
  (09) Silicates
  (09.E) Phyllosilicates
  (09.EB) Double nets with 4- and 6-membered rings
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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