Localisation du fer, par voie chimique et par spectrométrie Mössbauer, dans la lépidolite du granite de Beauvoir (Massif central français)

Abstract

The localization of iron in lepidolites from « granite de Beauvoir » (Massif central, France) has been investigated using a chemical method and Mössbauer effect. The chemical method consists in the comparison between the dissolution of iron and the dissolution of other elements in hot solution of diluted HCl. The results of chemical and physical methods are in excellent agreement. Totality of iron is isomorphically substitued in the lattice of the lepidolite. In addition, Mössbauer parameters show that iron is in six-coordinate environments mainly in Fe²⁺ oxydation state. A disordered distribution of Fe²⁺ is observed for these lepidolites.