049 Monzodiorite

Description

This sample is a diorite (monzodiorite). A coarse-grained igneous rock consisting of quartz, feldspar and plagioclase with accessory mica, pyroxene, amphibole and olivine. Crystal size lies between 2 and 4 mm and the most important kind of porosity is intercrysalline fissures. The presence of the orthoclase feldspar distinguishes this rock from a diorite and is termed as a monzodiorite. https://web.ua.es/es/digitalrocks/start.html