Mineral Information and Data:

Downeyite
SeO2 [CNMNC approved formula]

Named .

IMA status : Approved Species 1977 ()
CLASSIFICATION 
Dana
(8th edition) :
04.04.03.01  
  (04) Simple Oxides
  (04.04) with a cation charge of 4+ (A++++ O2)
  (04.04.03)
  
Nickel-Strunz
(10th edition) :
04.DE.05
  (04) Oxides and Hydroxides
  (04.D) Metal:Oxygen = 1:2 and similar
  (04.DE) With medium-sized cations; with various polyhedra
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
  
  
  
Other Properties: H2O Soluble.

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