Abstract

Synthesis, phase relations, and physical properties of solid phases in the systems tantalite-tapiolite-oxygen and tantalite-FeTaO 4 are described. In pegmatitic magma enriched in Ta, Fe, and Mn, the occurrence of one or more of the minerals tantalite, tapiolite, and wodginite and their ferrous-ferric ratios are controlled by the partial pressure of oxygen.

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