Mineral Information and Data:

Eldfellite
NaFe3+(SO4)2 [CNMNC approved formula]

Named after the locality: Eldfell Cinder Cone, Heimaey island, Vestmannaeyjar archipelago, Iceland.

IMA status : Approved Species 2007 ()
CLASSIFICATION 
Dana
(8th edition) :
28.03.04.02  
  (28) Anhydrous Acid and Sulfates
  (28.03) (A++) XO4
  (28.03.04)
  
Nickel-Strunz
(10th edition) :
07.AC.15
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.A) Sulfates (selenates, etc.) without Additional Anions, without H2O
  (07.AC) With medium-sized and large cations
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  
Other Properties: H2O Soluble.

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