published in earth

Igneous rocks classification

Igneous rocks can be classified in two main categories: intrusive rocks and extrusive rocks. Within each of these broad categories, the rocks are classified as acidic, intermediate, basic and ultrabasic on the chemical basis of their silica content or by their mineralogical composition, the proportions of lighter-coloured felsic minerals and darker mafic minerals.

With the sponsorship of the Italian Ministry of Education, Universities and Research
Eni S.p.A. - P.IVA 00905811006