Mineral Information and Data:

Nissonite
Cu2Mg2(PO4)2(OH)2 • 5H2O [CNMNC approved formula]

Named for William H. Nisson (1912-1965), amateur mineralogist, mineral collector and dealer, of Petaluma, California, USA.

IMA status : Approved Species 1996 ()
CLASSIFICATION 
Dana
(8th edition) :
42.07.05.01  
  (42) Hydrated Phosphates Containing Hydroxyl or Halogen
  (42.07) where (AB)5 (XO4)3 Zq · x(H2O)
  (42.07.05)
  
Nickel-Strunz
(10th edition) :
08.DC.05
  (08) Phosphates, Arsenates, Vanadates
  (08.D) Phosphates, etc
  (08.DC) With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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