Mineral Information and Data:

Manjiroite
Na(Mn4+,Mn2+)8O16 • nH2O [CNMNC approved formula]

Named for Manjiro Watanabe (1891-?), Emeritus Professor of Mineralogy, Tohoku University, Sendai, Japan.

IMA status : Approved Species 1967 ()
CLASSIFICATION 
Dana
(8th edition) :
07.09.01.03  
  (07) Multiple Oxides
  (07.09)
  (07.09.01) Cryptomelane Group (Hard black, fine-grained)
  
Nickel-Strunz
(10th edition) :
04.DK.05
  (04) Oxides and Hydroxides
  (04.D) Metal:Oxygen = 1:2 and similar
  (04.DK) With large (+- medium-sized) cations; tunnel structures
  
Crystal system: Tetragonal System
Point group (H-M): 4/m — dipyramidal
  
  
  

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