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Columbite-Tantalite from
Kawadgaon-Challanpara pegmatite field, Dantewada District, Chhattisgarh, India
| Locality type: | Pegmatite Field | |
| Classification | ||
|---|---|---|
| Species: | 'Columbite-Tantalite' (not an IMA approved species) | |
| Comments: | Columbite-tantalite is black and brownish black, and is fine to coarse-grained, massive, tabular (generally 0.1 -2.0 cm thick), and vertically stacked crystals. It occurs randomly distributed in the intermediate zone, but is mostly located close to quartz core. The largest crystal found was 15 cm in length, 11cm in breadth, and 4.5 cm in thickness. In addition, it also occurs as fine grains and lumps. Intergrown columbite-tantalite and ixiolite crystals may occur with relative variable abundances. Such intergrowths contain more Ta than Nb. Columbite-tantalite shows large chemical variations. It contains 30.93 to 58.51% Nb2O5, 16.32 to 38.80% Ta2O5, and 0.84 to 16.77% SnO2. In general Fe (10.08 to 15.19% FeO) predominates over Mn (2.84 to 6.78% MnO), with Ta/(Ta+Nb) 0.25 to 0.64 and Mn/(Mn+Fe) 0.51 to 0.37. Appreciable amounts of W (0.38 to 1.40% WO3) and Ti (1.43 to 2.64% TiO2) are also present. The columbite-tantalite is invariably radioactive due to presence of U (0.08 to 0.17% U3O8) and Th (0.02 to 1.03% ThO2) contents | |
| Habit: | tabular | |
| Colour: | black and brownish black | |
| Confirmation | ||
| Validity: | Believed Valid | |
| Data | ||
| Mineral Data: | Click here to view Columbite-Tantalite data | |
| Locality Data: | Click here to view Kawadgaon-Challanpara pegmatite field, Dantewada District, Chhattisgarh, India | |
| Data Identifiers | ||
| Mindat Occurrence Record ID: | 1864546 | |
| Long-form Identifier: | 1:3:1864546:4 | |
| GUID (UUID V4): | 0 | |
| Nearest other occurrences of Columbite-Tantalite | ||
| 42.1km (26.2 miles) | ⓘChiurwada pegmatites, Bastar district, Chhattisgarh, India | |
| 45.5km (28.3 miles) | ⓘGovindpal pegmatites, Bastar district, Chhattisgarh, India | |
| 49.0km (30.4 miles) | ⓘChitalnar pegmatites, Bastar district, Chhattisgarh, India | |
| 51.5km (32.0 miles) | ⓘMundval pegmatites, Sukma district, Chhattisgarh, India | |
| References | ||
Singh, Yamuna, Pandit, P. S. C., Bagora, Sanjay, Jain, P. K. (2017) Mineralogy, geochemistry, and genesis of co-genetic granite-pegmatite-hosted rare metal and rare earth deposits of the Kawadgaon area, Bastar craton, Central India. Journal of the Geological Society of India, 89 (2) 115-130 doi:10.1007/s12594-017-0574-2 | ||
