Mineral Information and Data:

Kapustinite
Na6ZrSi6O16(OH)2 [CNMNC approved formula]

Named for Yu. L. Kapustin (1933-2002), Russian mineralogist who extensively studied alkaline massifs.

IMA status : Approved Species 2003 ()
CLASSIFICATION 
Dana
(8th edition) :
61.01.02a.06  (This Dana# Added)
  (61) Cyclosilicate Six-Membered Rings
  (61.01) with [Si6O18] rings; possible (OH) and Al substitution
  (61.01.02a) Lovozerite group (HEX and HEX-R subgroup)
  
Nickel-Strunz
(10th edition) :
09.CJ.15
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CJ) [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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