Mineral Information and Data:

Omongwaite
Na2Ca5(SO4)6 • 3H2O [CNMNC approved formula]

Named for the locality : Omongwa (salt) pan, near Aminuis, 140 km SSE of Gobabis, southwestern Kalahari, Namibia.

IMA status : Approved Species 2005 ()
CLASSIFICATION 
Dana
(8th edition) :
29.04.07.02  
  (29) Hydrated Acid and Sulfates
  (29.04) where (A+)2 Bn (XO4)p · x(H2O)
  (29.04.07)
  
Nickel-Strunz
(10th edition) :
07.CD.65
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.C) Sulfates (selenates, etc.) without Additional Anions, with H2O
  (07.CD) With only large cations
  
Crystal system: Monoclinic System
Point group (H-M): 2 — sphenoidal
  
  
  

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