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Formula: CeO2
Simple oxide, uraninite group,
cerium-bearing mineral
Crystal System: Isometric
Specific gravity: 7.216
Colour: Dark green-amber
RADIOACTIVE
Environments
Localities
At Morro do Ferro, Poços de Caldas, Poços de Caldas alkaline complex, Minas Gerais, Brazil, cerianite-(Ce) is a
secondary mineral weathered from
phonolite and
nepheline syenite. Associated minerals include
hydrobiotite, kaolinite and
limonite
(HOM).
At Gakara Project, Bujumbura Rural Province, Burundi, cerianite-(Ce) is associated with
fluocerite and bastnäsite
(HOM).
At the type locality, the Dominion Gulf Company claims, Lackner Township, Sudbury District, Ontario, Canada,
cerianite-(Ce) occurs sparingly, in partially absorbed inclusions of wall-rock in a dikelike zone of
carbonate rock cutting nepheline syenite. Associated minerals
include nepheline, tremolite,
feldspar, apatite,
magnetite, ilmenite and
calcite
(HOM).
At Sushina Hill, Purulia District, West Bengal, India, cerianite-(Ce) occurs in
nepheline syenite
gneiss. Hydrothermal cerianite-(Ce), formed by the decomposition of
eudialyte in the agpaitic rocks, occurs as small rounded crystals
(MM 77.3137-3153).
At Kåbuland, Iveland, Agder, Norway, cerianite-(Ce) occurred in a
pegmatite associated with
fluocerite, bastnäsite and
törnebohmite
(HOM).
At the Kerimasi volcano, Monduli District, Arusha Region, Tanzania, cerianite-(Ce) occurs as rounded grains up
to 5 μm across in a block of highly altered calcite
carbonatite lava, and as euhedral crystals up to 200 μm
across in carbonatite-derived eluvial deposits in the Kisete
and Loluni explosion craters in the Gregory Rift. The cerianite-(Ce) is considered to be a late-stage
secondary mineral in the
carbonatitic rocks
(MM 75.2813-2822).
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