Mineral Information and Data:

Arsenoflorencite-(La)
LaAl3(AsO4)2(OH)6 [CNMNC approved formula]

Named for its relationship to florencite [and arsenoflorencite-(Ce)] with La as the dominant REE.

IMA status : Approved Species 2010 (IMA2009-078)
CLASSIFICATION 
Dana
(8th edition) :
41.05.11.03  
  (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 — ditrigonal-pyramidal
Unit cell: a = 7.0316(3) Å, c = 16.5151(8) Å
Crystal Habit: rhombohedral, pseudocubic or tabular crystals up to about 0.2 mm across
  
Color: Orange– red to pink
Diaphaneity: Transparent to translucent
Luster: Vitreous
Hardness (Mohs): 3.5
Tenacity: Brittle
Fracture: Uneven
Streak: Very light pink streak
  
Geologic Setting: It occurs in Mn-rich nodules in metasediments (Grubependity Lake cirque, Maldynyrd range, upper Kozhim River basin, Prepolar Ural, Komi Republic, Russia.)
Mineral Association: Zircon, quartz, hematite, ardennite-(As), andalusite, anorthite, sericite, clinochlore, chernovite-(Y), manganiandrosite- (La), spessartine and monazite–gasparite-group minerals
  

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