The biotite-prehnite association

摘要: Abstract Prehnite interleaved with biotite in altered diorite from S.E. Queensland and elsewhere has a lens-shaped form which bows the enclosing mica cleavages. Despite first description of texture 1918 identification prehnite 1936 only few references to intergrowth can be found. Genetic considerations usually involve K metasomatism hornblende or crystallization place amphibole. Although it appears as if developed by replacement biotite, volume for both phyllosilicates mitigate against simple insertion Ca 2 Al K(Mg,Fe) 3 within basic sheet structure. At present is suggested that response deuteric reactions.