Mineral Information and Data:

Callaghanite
Cu2Mg2CO3(OH)6 • 2H2O [CNMNC approved formula]

Named for Eugene Callaghan (1904-1990), Director of the New Mexico Bureau of Mines, Socorro, New Mexico, USA.

IMA status : Valid species (Pre-IMA 1954) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
16b.05.01.01  
  (16b) Carbonates - Hydroxyl or Halogen
  (16b.05) with miscellaneous formulae
  (16b.05.01)
  
Nickel-Strunz
(10th edition) :
05.DA.25
  (05) Carbonates and Nitrates
  (05.D) Carbonates with Additional Anions, with H2O
  (05.DA) With medium-sized cations
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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