Mineral Information and Data:

Ramsdellite
Mn4+O2 [CNMNC approved formula]

Named after the American mineralogist, Lewis S. Ramsdell (1895-1975), of the University of Michigan, who first described the mineral.

IMA status : Valid species (Pre-IMA 1943) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
04.04.07.01  
  (04) Simple Oxides
  (04.04) with a cation charge of 4+ (A++++ O2)
  (04.04.07)
  
Nickel-Strunz
(10th edition) :
04.DB.15a
  (04) Oxides and Hydroxides
  (04.D) Metal:Oxygen = 1:2 and similar
  (04.DB) With medium-sized cations; 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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