Abstract
A camptonite dyke occuring near San Feliú de Buxalleu has been subjected to detailed petrographic study. The rock is composed of altered olivine, clinopyroxene and brown amphibole phenocrysts in a groundmass of basic plagioclase, analcite and brown amphibole. There are three generations of clinopyroxene, the latest being comparatively enriched in Al and Ti and poor in Si. The brown amphibole phenocrysts were found to be of pargasite-ferrohastingsite composition, and can be called kaersutite. A comparison is made between this rock and the type camptonite from New Hampshire (U. S. A.), and a new analysis is given for the amphibole from this latter rock. This study is based upon six new chemical analysis.
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