Mineral Information and Data:

Volborthite
Cu3V2O7(OH)2 • 2H2O [CNMNC approved formula]

Named for Alexander von Volborth (1800-1876), Russian paleontologist who first noted the mineral.

IMA status : Approved Species 1838 ()
CLASSIFICATION 
Dana
(8th edition) :
40.03.10.01  
  (40) Hydrated Phosphates
  (40.03) where (A++)3 (XO4)2 · x(H2O)
  (40.03.10)
  
Nickel-Strunz
(10th edition) :
08.FD.05
  (08) Phosphates, Arsenates, Vanadates
  (08.F) Polyphosphates, Polyarsenates, [4]-Polyvanadates
  (08.FD) Polyphosphates, etc., with OH and H2O
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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