gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1994.58A.1.14 The Origin of the Columbretes Islands's Basanitic and Phonolitic Magmas (Western Mediterranean) Aparicio A. Araña V. García R. Dpto. Volcanología, Museo Nacional Ciencias Naturales, CSIC. Madrid Grachev A. Instituto Física de la Tierra, Moscú 8 1994 58A 1 21 22 Copyright © 1994, The Mineralogical Society 1994