Mineral Information and Data:

Berthierine
(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4 [CNMNC approved formula]

Named for Pierre Berthier (1782-1861), French geologist.

IMA status : Valid species (Pre-IMA 1832) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
71.01.02c.02  
  (71) Phyllosilicate Sheets of Six-Membered Rings
  (71.01) with 1:1 layers
  (71.01.02c) Serpentine group (Amesite subgroup)
  
Nickel-Strunz
(10th edition) :
09.ED.15
  (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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