Mineral Information and Data:

Cerianite-(Ce)  
CeO2 [CNMNC approved formula]

Named for CERium in its composition, and by analogy to thorianite and uraninite. First published in 1955. Name changed from cerianite per mineral nomenclature (IMA, 1987).

IMA status : Renamed IMA Approved; 1987 ()
CLASSIFICATION 
Dana
(8th edition) :
04.04.12.01  
  (04) Simple Oxides
  (04.04) with a cation charge of 4+ (A++++ O2)
  (04.04.12)
  
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
Space group: Fm3m
Unit cell: a = 5.41-5.42 Ǻ, Z=4
Crystal Habit: As octahedra, to 2 em; earthy, massive.
  
Color: Dark greenish amber-yellow, yellow to buff in ocherous aggregates
Diaphaneity: Translucent to transparent
Measured Density: 7.195 (calculated) g/cm3
  
Geologic Setting: Sparingly, in partially absorbed inclusions of wall-rock in a dikelike zone of carbonate rock cutting nepheline syenite (Sudbury, Canada); a secondary mineral weathered from phonolites and nepheline syenites (Minas Gerais, Brazil); in pegmatite (Kabuland, Norway).
Mineral Association: Nepheline, tremolite, feldspar, apatite, magnetite, ilmenite, calcite (Sudbury, Canada); hydromica, kaolinite, "limonite" (Morro do Ferro, Brazil); fluocerite, bastnasite, tornebohmite (Kabuland, Norway); fluocerite, bastnasite (Karonge, Burundi).
  
Other Properties: Radioactive.

 

Cerianite-(Ce)
Black crystals or grains, exhibiting a greasy luster.
Mineral identification confirmed by a single-crystal X-ray diffraction.
Origin: Sierra de Bermejillo, Durango, Mexico
Photo: © RRUFF Project

 

Cerianite-(Ce)
(zoom-in of above)

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