Resumen de Estudio mineralógico y cristaloquímico de la casiterita del yacimiento de Lumbrales (Salamanca, España)

Ascensión Murciego Murciego, José María Martín Pozas, A. García Sánchez, F. J. Gonzalo Corral

• Cassiterite from the Lumbreras deposit (Salamanca, Spain) is inhomogeneous there are light-colored zones, relatively, pure and dark zones, enriched in Ti, Fe, Nb and Ta (the upper concentrations are 3, 22%, 1, 7%, 2, 4% and 1, 4% respectively). Columbite-Tantalite and Ilmenorutile-Struverite microinclusions are located in the light-colored parts. The interpretation of the Fe+Mn/Nb+Ta interelement relationships and the EPR aspectrometric results reveal that coupled substitutions of the type: 1)2Sn4+--F3++(Nb, Ta)5+, 2) Sn4++o2--F3++oH- and 3) 3Sn4+--Fe2++(Nb, Ta) 5+are dominant in this cassiterite.