Mineral Information and Data:

Wightmanite
Mg5O(BO3)(OH)5 • 2H2O [CNMNC approved formula]

Named for Randall H. Wightman (1915-1969), Director of Exploration and Mining of the Riverside Cement Co., Riverside, California, USA.

IMA status : Approved Species 1962 ()
CLASSIFICATION 
Dana
(8th edition) :
26.01.02.01  
  (26) Hydrated Borates Containing Hydroxyl or Halogen
  (26.01)
  (26.01.02)
  
Nickel-Strunz
(10th edition) :
06.AB.55
  (06) Borates
  (06.A) Monoborates
  (06.AB) BO3, without additional anions; 1(D) + OH, etc.
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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