Mineral Information and Data:

Chapmanite
Fe3+2Sb3+(SiO4)2(OH) [CNMNC approved formula]

Named after the Canadian mineralogist, E. J. Chapman.

IMA status : Approved Species 1924 ()
CLASSIFICATION 
Dana
(8th edition) :
71.01.03.02  
  (71) Phyllosilicate Sheets of Six-Membered Rings
  (71.01) with 1:1 layers
  (71.01.03) Bismutoferrite group
  
Nickel-Strunz
(10th edition) :
09.ED.25
  (09) Silicates
  (09.E) Phyllosilicates
  (09.ED) Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
  
Crystal system: Monoclinic System
Point group (H-M): m — domatic
  
  
  

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