Mineral Information and Data:

Zirkelite  
(Ti,Ca,Zr)O2-x [CNMNC approved formula]

Named for Ferdinand Zirkel (1838-1912), German petrographer, Professor of Mineralogy, University of Leipzig, Leipzig, Germany.

IMA status : Valid species (Pre-IMA 1960) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
08.02.05.01  
  (08) Multiple Oxides with Nb, Ta, and Ti
  (08.02) where (A)2 (B2O6) (O,OH,F)
  (08.02.05) Zirconolite Group
  
Nickel-Strunz
(10th edition) :
04.DL.05
  (04) Oxides and Hydroxides
  (04.D) Metal:Oxygen = 1:2 and similar
  (04.DL) With large (+- medium-sized) cations; fluorite-type structures
  
Crystal system: Cubic System
Point group (H-M): m3m (or 4/m 3 2/m) — hexoctahedral
  
  
  
Other Properties: Radioactive.

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