Mineral Information and Data:

Eugsterite
Na4Ca(SO4)3 • 2H2O [CNMNC approved formula]

Named for Hans P. Eugster (1925-1987), Swiss-American mineralogist, John Hopkins University, awarded the Roebling Medal, 1983.

IMA status : Approved Species 1981 ()
CLASSIFICATION 
Dana
(8th edition) :
29.04.02.01  
  (29) Hydrated Acid and Sulfates
  (29.04) where (A+)2 Bn (XO4)p · x(H2O)
  (29.04.02)
  
Nickel-Strunz
(10th edition) :
07.CD.25
  (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:  
Point group (H-M):
  
  
  
Other Properties: H2O Soluble.

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