UM1999-31-Si:REE
Invalid as an unnamed mineral
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Formula:
(Ce,La,Nd,Gd,Pr)Si
May be an artifact. So is the co-described UM1999-30-Si:AlFe. Both found with silicon, in processed gold samples.
As grains (round, droplike, dendritic, and xenomorphic), up to 50 µm in size, in aggregates of FeSi2, UM1999-30-Si:AlFe, and silicon.
Average electron microprobe data, wt.%:
La 24.26
Ce 36.92
Pr 4.73
Nd 8.92
Gd 3.25
Si 16.75
Fe 0.44
Al 1.12
Ca 3.61
total 100.00
This may correspond to La0.18Ce0.26Pr0.03Nd0.06Gd0.02Ca0.09Si0.60Fe0.01Al0.04 or (REE0.85Ca0.14)Σ0.99(Si0.92Al0.06Fe0.02)Σ1.00.
As grains (round, droplike, dendritic, and xenomorphic), up to 50 µm in size, in aggregates of FeSi2, UM1999-30-Si:AlFe, and silicon.
Average electron microprobe data, wt.%:
La 24.26
Ce 36.92
Pr 4.73
Nd 8.92
Gd 3.25
Si 16.75
Fe 0.44
Al 1.12
Ca 3.61
total 100.00
This may correspond to La0.18Ce0.26Pr0.03Nd0.06Gd0.02Ca0.09Si0.60Fe0.01Al0.04 or (REE0.85Ca0.14)Σ0.99(Si0.92Al0.06Fe0.02)Σ1.00.
Unique Identifiers
Mindat ID:
54151
Long-form identifier:
mindat:1:1:54151:2
Similar Names
| UM1974-13-S:IrRh | (Ir,Rh)S2 | |
| UM1976-19-S:Ru | (Ru,Ir,Os,Rh,Pt)3(S,As)4 | |
| UM1980-13-S:IrRh | ~Ir3Rh3S8 | |
| UM1986-51-S:Re | Re2S3 | |
| UM1994-24-S:Rh | Rh11S9 | |
| UM1995-33-S:Rh | Valid as an unnamed mineral | Rh5S4 |
| UM1999-05-AsO:REE | A synonym of Gasparite-(La) | |
| UM2002-27-S:Rh | Invalid as an unnamed mineral | RhS |
IMA Classification of UM1999-31-Si:REE
IMA status notes:
Unnamed (probably invalid)
Chemistry of UM1999-31-Si:REE
Mindat Formula:
(Ce,La,Nd,Gd,Pr)Si
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 UM1999-31-Si:REE
mindat.org URL:
https://www.mindat.org/min-54151.html
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References for UM1999-31-Si:REE
Reference List:
Kachalovskaja, V.M., Chvileva, T.N., Osipov, B.S., Evstigneeva, T.L., Kononov, I.V., Nazarenko, N.G. (1999): REE-bearing silicides from the Fazenda-Brazileiro gold ore deposit, Brazil. Zapiski Vseross. Mineral. Obshch.: 128(2): 80–88 (in Russian)(Abs. in: Jambor, J.L., Kovalenker, V.A., Roberts, A.C.(2000): New mineral names. Am. Min. 85: 876)
Localities for UM1999-31-Si:REE
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - 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).
All localities listed without proper references should be considered as questionable.
Brazil | |
| Kachalovskaja et al. (1999) +1 other reference |
