Lateritic niobium ore. Cancrinite syenite intruded by Nb-bearing calcite-carbonatite.
Refs.:
- Nasraoui, M. and Waerenborgh, J.C. (2001) Fe speciation in weathered pyrochlore-group minerals from the Lueshe and Araxá (Barreiro) carbonatites by 57Fe Mössbauer spectroscopy. Canadian Mineralogist: 39: 1073-1080.
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http://www.emse.fr/~moutte/carbtit/lueshe/eug1999/
14 entries listed. 12 valid minerals. 2 type localities (valid minerals).