Mineral Information and Data:

Chalcoalumite
CuAl4SO4(OH)12 • 3H2O [CNMNC approved formula]

Named from the Greek chalkos, for copper and Latin alum, for aluminum sulfate.

IMA status : Valid species (Pre-IMA 1925) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
31.03.01.01  
  (31) Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.03) where (A+ B++)5 (XO4) Zq · x(H2O)
  (31.03.01)
  
Nickel-Strunz
(10th edition) :
07.DD.75
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.D) Sulfates (selenates, etc.) with additional anions, with H2O
  (07.DD) With only medium-sized cations; sheets of edge-sharing octahedra
  
Crystal system: Monoclinic System
Point group (H-M): 2 — sphenoidal
  
  
  

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