The episyenite northeast of Eup, Haute-Garonne, France, intruding the Triassic sedimentary cover on the eastern margin of the Barousse massif, is essentially composed of albite, barkevicite, and epidote, and is considered to have evolved from a berondrite. It is traversed by leucocratic veins, consisting almost exclusively of more or less dipyrized plagioclase, which represent an end stage in which the amphibole has disappeared. Chemical analyses are included.

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