Mineral Information and Data:

Hallimondite  
Pb2(UO2)(AsO4)2 • nH2O [CNMNC approved formula]

Named for Arthur Francis Hallimond (1890-1968), British mineralogist, London, England, for his work with secondary uranium minerals.

IMA status : Approved Species 1965 ()
CLASSIFICATION 
Dana
(8th edition) :
40.02a.32.01  
  (40) Hydrated Phosphates
  (40.02a) where A++ (B++)2 (XO4) · x(H2O), containing (UO2)++
  (40.02a.32)
  
Nickel-Strunz
(10th edition) :
08.EA.10
  (08) Phosphates, Arsenates, Vanadates
  (08.E) Uranyl Phosphates and Arsenates
  (08.EA) UO2:RO4 = 1:2
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
  
  
  
Other Properties: Radioactive.
Comments: Radioactive.

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