Mineral Information and Data:

Hydroxylborite
Mg3(BO3)(OH)3 [CNMNC approved formula]

Named as the OH analogue of fluoborite.

IMA status : Approved Species 2005 ()
CLASSIFICATION 
Dana
(8th edition) :
25.01.02.02  
  (25) Anhydrous Borates Containing Hydroxyl or Halogen
  (25.01)
  (25.01.02)
  
Nickel-Strunz
(10th edition) :
06.AB.50
  (06) Borates
  (06.A) Monoborates
  (06.AB) BO3, without additional anions; 1(D) + OH, etc.
  
Crystal system: Hexagonal System
Point group (H-M): 6/m — dipyramidal
  
  
  

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