Mineral Information and Data:

Bastnasite-(La)
LaCO3F [CNMNC approved formula]

Named as the La-predominant rare earth element in the bastnasite group. Group named after its locality: Bastnas Mine, Riddarhyttan district, Vastermanland, Sweden. Name defined per nomenclature of rare-earth minerals (IMA, 1966).

IMA status : Approved Species 1966 ()
CLASSIFICATION 
Dana
(8th edition) :
16a.01.01.02  
  (16a) Carbonates - Hydroxyl or Halogen
  (16a.01) in the Bastnasite/Shynchysite/Parasite Groups
  (16a.01.01) Bastnasite Subgroup
  
Nickel-Strunz
(10th edition) :
05.BD.20a
  (05) Carbonates and Nitrates
  (05.B) Carbonates with additional anions, without H2O
  (05.BD) With rare earth elements (REE)
  
Crystal system: Hexagonal System
Point group (H-M): 6m2 (or 6m2) — ditrigonal-dipyramidal
Space group: P6c2
Crystal Habit: Fine-grained massive.
  
Color: Dark brown
Diaphaneity: Semi-transparent
  
Geologic Setting: In late ankerite carbonatites (Belaya Zima deposit, Russia).
Mineral Association: Fluocerite, cerianite-(Ce) (near Odegi, Nigeria).
  

 

Bastnasite-(La)
Bastnasite-La
Origin: Mochalin Log, Kyshtym, Chelyabinsk Oblast', Urals Region, Russia
Sample size: Brown massive 1cm piece
Photo: Tom Loomis

 

Bastnasite-(La)
(zoom-in of above)

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