Mineral Information and Data:

Bergslagite
CaBeAsO4(OH) [CNMNC approved formula]

Named for the occurrence at Langban, which is in the Bergslagen region of Sweden.

IMA status : Approved Species 1982 ()
CLASSIFICATION 
Dana
(8th edition) :
41.05.04.04  
  (41) Anhydrous Phosphates Containing Hydroxyl or Halogen
  (41.05) where (A B)2 (XO4) Zq
  (41.05.04) Herderite Group
  
Nickel-Strunz
(10th edition) :
08.BA.10
  (08) Phosphates, Arsenates, Vanadates
  (08.B) Phosphates, etc. with Additional Anions, without H2O
  (08.BA) With small and medium-sized cations
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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