Mineral Information and Data:

Retzian-(Ce)
Mn2+2CeAsO4(OH)4 [CNMNC approved formula]

Named for Anders Jahan Retzius (1742-1821), Swedish naturalist.

IMA status : Approved Species 1894 ()
CLASSIFICATION 
Dana
(8th edition) :
41.03.04.01  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.03) where (A B)3 (XO4) Zq
  (41.03.04) Retzian Series
  
Nickel-Strunz
(10th edition) :
08.BM.05
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BM) With medium-sized and large cations, (OH, etc.):RO4 = 4:1
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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