Английская Википедия:Cerianite-(Ce)
Шаблон:Short description Шаблон:Infobox mineral Cerianite-(Ce) is a relatively rare oxide mineral, belonging to uraninite group with the formula Шаблон:Chem.[1][2] It is one of a few currently known minerals containing essential tetravalent cerium, the other examples being stetindite and dyrnaesite-(La).[3][4]
Occurrence and association
Cerianite-(Ce) is associated with alkaline rocks, mostly nepheline syenites.[5] It may be found in carbonatites.[1] Cerianite-(Ce) associates with minerals of the apatite group, bastnäsite-group minerals, calcite, feldspar, "fluocerite", "hydromica", ilmenite, nepheline, magnetite, "törnebohmite" and tremolite.[5] It is the most simple cerium mineral known.[1]
Notes on chemistry
Beside thorium cerianite-(Ce) may contain trace niobium, yttrium, lanthanum, ytterbium, zirconium and tantalum.[5]
Crystal structure
For details on crystal structure see cerium(IV) oxide. Both ceria and thoria have a fluorite structure.
References
Шаблон:Reflist Шаблон:Oxide-mineral-stub
- ↑ Перейти обратно: 1,0 1,1 1,2 Шаблон:Cite web
- ↑ Graham, A.R., 1955. Cerianite CeO2: a new rare-earth oxide mineral. American Mineralogist 40, 560-564
- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
- ↑ Перейти обратно: 5,0 5,1 5,2 Шаблон:Cite web
