Mineral Information and Data:

Volkonskoite
Ca0.3(Cr,Mg)2(Si,Al)4O10(OH)2 • 4H2O [CNMNC approved formula]

Named for Prince A. Volkonskoi, Minister of the Imperial Court, Russia.

IMA status : Approved Species 1830 ()
CLASSIFICATION 
Dana
(8th edition) :
71.03.01a.04  
  (71) Phyllosilicate Sheets of Six-Membered Rings
  (71.03) with 2:1 clays
  (71.03.01a) Smectite group (Dioctahedral Smectites)
  
Nickel-Strunz
(10th edition) :
09.EC.40
  (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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