Foordite-Thoreaulite Series
A solid-solution series between two end-member minerals
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About Foordite-Thoreaulite Series
Crystal System:
Monoclinic
Series Formula:
Sn2+Nb2O6 to Sn2+Ta2O6
A series between Foordite and Thoreaulite
Rare constituents of complex, rare-element, Li-Cs-Ta-rich (LCT-family) granitic pegmatites. Influx of late-magmatic to hydrothermal fluids and/or alkali elements under higher fO2 may cause breakdown of foordite-thoreaulite and production of cassiterite and numerous Nb, Ta-oxide minerals (Uher et al., 2008).
Rare constituents of complex, rare-element, Li-Cs-Ta-rich (LCT-family) granitic pegmatites. Influx of late-magmatic to hydrothermal fluids and/or alkali elements under higher fO2 may cause breakdown of foordite-thoreaulite and production of cassiterite and numerous Nb, Ta-oxide minerals (Uher et al., 2008).
Unique Identifiers
Mindat ID:
8657
Long-form identifier:
mindat:1:1:8657:4
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| SnO | 25.4 % |
| PbO | 6.0 % |
| Ta2O5 | 28.7 % |
| Nb2O5 | 40.1 % |
| Total: | 100.2 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Lutsiro, Rutsiro District, Western Province, Rwanda | holotype specimen |
Crystallography of Foordite-Thoreaulite Series
Crystal System:
Monoclinic
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0015601 | Thoreaulite | Maksimova N V, Ilyukhin V V, Belov N V (1975) Crystal structure of thoreaulite, SaTa2O6 Soviet Physics Doklady 20 528-529 | 1975 | Manono, Katanga, Democratic Republic of the Congo | 0 | 293 | |
| 0005219 | Foordite | Ercit T S, Cerny P (1988) The crystal structure of foordite The Canadian Mineralogist 26 899-903 |  | 1988 | 0 | 293 | |
| 0000199 | Thoreaulite | Mumme W G (1970) The crystal structure of SnTa2O7, thoreaulite, an example of tin in five-fold coordination American Mineralogist 55 367-377 | | 1970 | 0 | 293 |
CIF Raw Data - click here to close
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 Foordite-Thoreaulite Series
mindat.org URL:
https://www.mindat.org/min-8657.html
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References for Foordite-Thoreaulite Series
Reference List:
Localities for Foordite-Thoreaulite Series
Showing 14 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 | |
| [Thoreaulite] Cassedanne et al. (1981) +1 other reference |
China | |
| [Thoreaulite] Deshi Lu (1993) |
DR Congo | |
| [Thoreaulite] Buttgenbach (1947) |
| [Thoreaulite] Uher et al. (2008) | |
| [Foordite] Kristiansen (2001) | |
| [Foordite] Daltry et al. (1998) +2 other references | |
| [Thoreaulite] Vanrusselt (2023) |
| [Foordite, Thoreaulite] T. Witzke |
Kazakhstan | |
| [Thoreaulite] Pekov (1998) |
| [Thoreaulite] Voloshin et al. (1983) +1 other reference |
Rwanda | |
| [Thoreaulite] Ann. Soc. Geol. Belgique |
| [Thoreaulite] Bertossa (1968) +1 other reference |
| [Foordite] Jambor et al. (1990) +2 other references |
Ognevka Ta deposit, Ulan District, East Kazakhstan Region, Kazakhstan