Mineral Information and Data:

Cornwallite
Cu5(AsO4)2(OH)4 [CNMNC approved formula]

Named after the English leader Cornwall.

IMA status : Valid species (Pre-IMA 1847) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
41.04.02.02  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.04) where (A B)5 (XO4)2 Zq
  (41.04.02)
  
Nickel-Strunz
(10th edition) :
08.BD.05
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BD) With only medium-sized cations, (OH, etc.):RO4= 2:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
Polymorphism and Series: Dimorphous with cornubite.
  

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