Nota sobre la composición química y mineralógica de los piroxenos monoclínicos existentes en lso basaltos de Fruniz (Vizcaya)

Abstract

Clinopyroxenes from the Fruniz (Vizcaya) basalts have been studied by chemical analysis and X-ray diffraction. The chemical analysis carried out by atomic absorption spectrography has led to the following structural composition Wo44,4 En 47,2 Fs  8,4 which is in agreement with the composition Wo 42  En 48 Fs 10 obtained irom the interpretation of the crystal powder patterns. According to these data the mineralogical composition of these pyroxenes is situated between endiopside and augite.