Mineral Information and Data:

Britholite-(Y)
(Y,Ca)5(SiO4)3OH [CNMNC approved formula]

Named From the Greek for weight, in allusion to its density and the content of Y.

IMA status : Approved Species 1966 ()
CLASSIFICATION 
Dana
(8th edition) :
52.04.09.02  
  (52) Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.04) with cations in [6] and/or > [6] coordination
  (52.04.09) Silicate apatites
  
Nickel-Strunz
(10th edition) :
09.AH.25
  (09) Silicates
  (09.A) Nesosilicates (Isolated tetrahedron) structures
  (09.AH) Nesosilicates with CO3, SO4, PO4, etc.
  
Crystal system: Hexagonal System
Point group (H-M): 6/m — dipyramidal
  
  
  

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