Mineral Information and Data:

Sidwillite
MoO3 • 2H2O [CNMNC approved formula]

Named for Sidney Arthur Williams (1933- ), American mineralogist and petrologist of Douglas, Arizona, USA,.

IMA status : Approved Species 1985 ()
CLASSIFICATION 
Dana
(8th edition) :
04.05.06.01  
  (04) Simple Oxides
  (04.05) with a cation charge of 6+ (A++++++ O3)
  (04.05.06)
  
Nickel-Strunz
(10th edition) :
04.FJ.05
  (04) Oxides and Hydroxides
  (04.F) Hydroxides (without V or U)
  (04.FJ) Hydroxides with H2O +- (OH); corner-sharing octahedra
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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