Mineral Information and Data:

Chalcophyllite
Cu9Al(AsO4)2(SO4)1.5(OH)12 • 18H2O [CNMNC approved formula]

Named From the Greek, "copper" and fyllon, "leaf.".

IMA status : Valid species (Pre-IMA 1847) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
43.05.14.01  
  (43) Compound Phosphates
  (43.05) (Hydrated Compound Anions With Hydroxyl or Halogen)
  (43.05.14)
  
Nickel-Strunz
(10th edition) :
08.DF.30
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DF) With only medium-sized cations, (OH,etc.):RO4 > 3:1
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
  
  
  

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