Mineral Information and Data:

Groutite
Mn3+O(OH) [CNMNC approved formula]

Named for Frank Fitch Grout (1880-1958), petrologist, of the University of Minnesota, Minneapolis, Minnesota, USA.

IMA status : Valid species (Pre-IMA 1945) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
06.01.01.03  
  (06) Hydroxides and Oxides Containing Hydroxyl
  (06.01) where X+++O OH
  (06.01.01) Diaspore group (Orthorhombic, Pnma or Pnmd)
  
Nickel-Strunz
(10th edition) :
04.FD.10
  (04) Oxides and Hydroxides
  (04.F) Hydroxides (without V or U)
  (04.FD) Hydroxides with OH, without H2O; chains of edge-sharing octahedra
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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