Mineral Information and Data:

Loudounite
NaCa5Zr4Si16O40(OH)11 • 8H2O [CNMNC approved formula]

Named for the locality: Goose Creek Quarry, Loudoun Co., Virginia, USA.

IMA status : Approved Species 1983 ()
CLASSIFICATION 
Dana
(8th edition) :
59.02.02.05  
  (59) Cyclosilicate Three-Membered Rings
  (59.02) hydrated
  (59.02.02) Catapleiite group
  
Nickel-Strunz
(10th edition) :
09.HF.10
  (09) Silicates
  (09.H) Unclassified Silicates
  (09.HF) With Nb, Ta, Zr
  
Crystal system: Monoclinic System
Point group (H-M): Unknown — Unk
  
  
  

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