Mineral Information and Data:

Johannite  
Cu(UO2)2(SO4)2(OH)2 • 8H2O [CNMNC approved formula]

Named for Archduke Johann (1782-1859) of Austria, fornder of the Styrian Landsmuseum ing Graz.

IMA status : Valid species (Pre-IMA 1830) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
31.08.02.01  
  (31) Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.08) where (A+ B++)3 (XO4)2 Zq · x(H2O)
  (31.08.02)
  
Nickel-Strunz
(10th edition) :
07.EB.05
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.E) Uranyl Sulfates
  (07.EB) With medium-sized cations
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
  
  
  
Other Properties: Radioactive. H2O Soluble.
Comments: Radioactive.

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