Mineral Information and Data:

Hydrobiotite
K(Mg,Fe2+)6(Si,Al)8O20(OH)4 • nH2O [CNMNC approved formula]

Named for the water content and its relationship to biotite.

IMA status : Approved Species 1882 ()
CLASSIFICATION 
Dana
(8th edition) :
71.02.02d.01  
  (71) Phyllosilicate Sheets of Six-Membered Rings
  (71.02) with 2:1 Layers
  (71.02.02d) Mica Group (Hydromica subgroup)
  
Nickel-Strunz
(10th edition) :
09.EC.60
  (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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