Mineral Information and Data:

Hydroromarchite
Sn2+3O2(OH)2 [CNMNC approved formula]

Named as the hydrous version of romarchite.

IMA status : Approved Species 1971 ()
CLASSIFICATION 
Dana
(8th edition) :
06.04.02.01  
  (06) Hydroxides and Oxides Containing Hydroxyl
  (06.04) containing multiple cations
  (06.04.02)
  
Nickel-Strunz
(10th edition) :
04.FF.05
  (04) Oxides and Hydroxides
  (04.F) Hydroxides (without V or U)
  (04.FF) Hydroxides with OH, without H2O; various polyhedra
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
  
  
  

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