Fayalite definitions

fā'ə-līt'
A yellowish to black mineral, Fe2 SiO4 , of the olivine group.
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(mineralogy) Yellow, olive green, brown or black mineral with orthorhombic crystals of the olivine group, Fe2SiO4.
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Origin of fayalite

fayal (“Faial Island in the Azores") +"Ž -ite. Named in 1840.