Mineral Information and Data:

Montdorite
KFe2+1.5Mn2+0.5Mg0.5Si4O10(F,OH)2 [CNMNC approved formula]

Named for the locality: Mt. Dore stratovolcano, near La Bourboule, France.

IMA status : Approved Species 1979 ()
CLASSIFICATION 
Dana
(8th edition) :
71.02.02a.10  
  (71) Phyllosilicate Sheets of Six-Membered Rings
  (71.02) with 2:1 Layers
  (71.02.02a) Mica Group (Muscovite subgroup)
  
Nickel-Strunz
(10th edition) :
09.EC.15
  (09) Silicates
  (09.E) Phyllosilicates
  (09.EC) Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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