Crystal system Isometric Unit cell a = 5.42 Å; Z = 4 | Formula(repeating unit) (Ce,Th)O2 Space group Fm3m | |
Crystal class Hexoctahedral (m3m)H-M symbol: (4/m 3 2/m) | ||
Cerianite-(Ce) is a relatively rare oxide mineral, belonging to uraninite group with the formula (Ce,Th)O2. It is one of a few currently known minerals containing essential tetravalent cerium, the other examples being stetindite and dyrnaesite-(La).
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Occurrence and association
Cerianite-(Ce) is associated with alkaline rocks, mostly nepheline syenites. It may be found in carbonatites. Cerianite-(Ce) associates with minerals of the apatite group, bastnäsite-group minerals, calcite, feldspar, "fluocerite", "hydromica", ilmenite, nepheline, magnetite, "törnebohmite" and tremolite. It is the most simple cerium mineral known.
Crystal structure
For details on crystal structure see cerium(IV) oxide.
References
Cerianite-(Ce) Wikipedia(Text) CC BY-SA