Definitions for "Fayalite"
A black, greenish, or brownish mineral of the chrysolite group. It is a silicate of iron.
Fayalite (Fe2SiO4) is the iron rich end-member of the olivine solid-solution series. In common with all minerals in the olivine group, fayalite crystallizes in the orthorhombic system (space group Pbnm) with cell parameters a 4.82 Ã…, b 10.48 Ã… and c Ã… 6.09.