Mineral Information and Data:

Nenadkevichite
(Na,[])8Nb4(Si4O12)2(O,OH)4 • 8H2O [CNMNC approved formula]

Named for Konstantin A. Nenadkevich, Russian mineralogist and geochemist.

IMA status : Valid species (Pre-IMA 1955) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
60.01.03a.01  (This Dana# Changed)
  (60) Cyclosilicate Four-Membered Rings
  (60.01) as Titanosilicates
  (60.01.03a) Labuntsovite Group (Nenadkevichite subgroup Orthorhombic [Pbam])
  
Nickel-Strunz
(10th edition) :
09.CE.30a
  (09) Silicates
  (09.C) Cyclosilicates
  (09.CE) [Si4O12]8- 4-membered single rings (vierer-Einfachringe), without insular complex anions
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  
Comments: Dana # Changed from 60.1.3.1

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