UM1994-04-F:OREE
Valid as an unnamed mineral
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Formula:
Ce4O5F2
may also be fiven as (Ce,Nd,Ca,La,Th,Sm,Pr)4O5F2
Co-described with UM1994-05-F:OREE and 'Unnamed (Lanthanum Oxyfluoride)'. Apparently the first natural cerium oxyhalide.
As intimately intergrown aggregates (of the two), up to 200 microns in diameter, in quartz and zinnwaldite interstices, in a drill core.
Electron microprobe wt.% data (one of 4 analyses): ThO2 3.91, La2O3 3.66, Ce2O3 75.93, Pr2O3 1.56, Nd2O3, 6.55, Sm2O3 2.13, Dy2O3 0.10, Y2O3 0.49, CaO 2.02, F 6.22, 0~F 2.62, total 99.95. This corresponds to the empirical formula of (Ce0.769Nd0.065Ca0.060La0.037Th0.025Sm0.020Pr0.016Y0.007Dy0.001)O1.21F0.554 (based on Σ(cations)=1).
The PXRD pattern, though composite, bears 3.160(100), 2.739(40), 1.934(50), 1.649(40) and four weaker reflections attributable to fluorite-type cubic cell (a=5.470(8)). Hexanogal or tetragonal superstructure is not discuded.
As intimately intergrown aggregates (of the two), up to 200 microns in diameter, in quartz and zinnwaldite interstices, in a drill core.
Electron microprobe wt.% data (one of 4 analyses): ThO2 3.91, La2O3 3.66, Ce2O3 75.93, Pr2O3 1.56, Nd2O3, 6.55, Sm2O3 2.13, Dy2O3 0.10, Y2O3 0.49, CaO 2.02, F 6.22, 0~F 2.62, total 99.95. This corresponds to the empirical formula of (Ce0.769Nd0.065Ca0.060La0.037Th0.025Sm0.020Pr0.016Y0.007Dy0.001)O1.21F0.554 (based on Σ(cations)=1).
The PXRD pattern, though composite, bears 3.160(100), 2.739(40), 1.934(50), 1.649(40) and four weaker reflections attributable to fluorite-type cubic cell (a=5.470(8)). Hexanogal or tetragonal superstructure is not discuded.
Unique Identifiers
Mindat ID:
53507
Long-form identifier:
mindat:1:1:53507:0
GUID
(UUID V4):
(UUID V4):
a701b269-6643-406b-a697-c21a52254b6d
Classification of UM1994-04-F:OREE
IMA status notes:
Unnamed (probably valid)
Chemical Properties of UM1994-04-F:OREE
Formula:
Ce4O5F2
may also be fiven as (Ce,Nd,Ca,La,Th,Sm,Pr)4O5F2
may also be fiven as (Ce,Nd,Ca,La,Th,Sm,Pr)4O5F2
Elements listed:
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for UM1994-04-F:OREE
mindat.org URL:
https://www.mindat.org/min-53507.html
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Mineral Dealers:
References for UM1994-04-F:OREE
Reference List:
Localities for UM1994-04-F:OREE
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
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