Mineral Information and Data:

Darapskite
Na3(SO4)(NO3) • H2O [CNMNC approved formula]

Named for Ludwig Darapsky (1857-1916), German-Chilean chemist and mineralogist, Santiago, Chile.

IMA status : Approved Species 1891 ()
CLASSIFICATION 
Dana
(8th edition) :
20.01.01.01  
  (20) Compound Nitrates
  (20.01) with other anions
  (20.01.01)
  
Nickel-Strunz
(10th edition) :
07.DG.05
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.D) Sulfates (selenates, etc.) with additional anions, with H2O
  (07.DG) With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  
Other Properties: H2O Soluble.

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