Complex sentence: Forsterite (Mg 2 SiO 4; commonly abbreviated as Fo) is the magnesium-rich end-member of the olivine solid solution series, and is isomorphic with the iron-rich end-member, fayalite.
Split into simpler sentences: Forsterite (Mg 2 SiO 4; commonly abbreviated as Fo) is the magnesium-rich end-member of the olivine solid solution series. It is isomorphous with the iron-rich end-member, fayalite.