The Snieznik eclogites of Poland are intercalated with a migmatitic gneiss and form a lithologic series differentiated by the ratio of omphacite to carinthine. They range from the common eclogites without primary amphibole to rocks rich in carinthine. The latter cannot be designated as a true eclogite for they contain no omphacite and should be placed above the sequence. Several successive stages of amphibolitization are apparent. They are the individualization of a purer common secondary hornblende and of an acidic plagioclase, ending in ordinary amphiboles. These rocks were then affected by a potassium-type metasomatism on a regional scale which was responsible for the granitization and migmatization of the surrounding gneiss and culminated the metamorphic evolution of the lithologic unit.