Mineral Information and Data:

Cornetite
Cu3PO4(OH)3 [CNMNC approved formula]

Named for Jules Cornet (1865-1929), Belgian geologist.

IMA status : Valid species (Pre-IMA 1917) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
41.03.02.01  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.03) where (A B)3 (XO4) Zq
  (41.03.02)
  
Nickel-Strunz
(10th edition) :
08.BE.15
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BE) With only medium-sized cations, (OH, etc.):RO4 > 2:1
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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