Mineral Information and Data:

Arsenoflorencite-(Ce)
CeAl3(AsO4)2(OH)6 [CNMNC approved formula]

Named as the arsenic analog of florencite and the dominant rare earth element, cerium.

IMA status : Approved Species 1987 (IMA1985-053)
CLASSIFICATION 
Dana
(8th edition) :
41.05.11.01  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.05) where (A B)2 (XO4) Zq
  (41.05.11) Arsenoflorencite Group
  
Nickel-Strunz
(10th edition) :
08.BL.13
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BL) With medium-sized and large cations, (OH, etc.):RO4 = 3:1
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
Unit cell: a = 7.029 Å, c = 16.517 Å
Crystal Habit: As scalenohedral crystals, showing {1011} and {1012}, composed of misoriented domains; generally as subhedral grains, to 0.5 mm.
  
Color: Colorless, creamy white, light brown; light gray in reflected light
Diaphaneity: Transparent to translucent
Measured Density: 4.096 g/cm3
Tenacity: Brittle
Fracture: Conchoidal
  
Geologic Setting: As detrital grains in heavy mineral concentrates.
Mineral Association: Alunite, florencite-(Ce), quartz
  

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