Mineral Information and Data:

Monteregianite-(Y)
KNa2YSi8O19 • 5H2O [CNMNC approved formula]

Named for the Monteregian Hills, a series of intrusions.

IMA status : Approved Species 1987 ()
CLASSIFICATION 
Dana
(8th edition) :
72.05.01.02  
  (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.15
  (09) Silicates
  (09.E) Phyllosilicates
  (09.EB) Double nets with 4- and 6-membered rings
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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