A black or brown mineral which is an iron-rich form of olivine and occurs in many igneous rocks.‘These minerals occur with manganoan fayalite and manganoan magnetite in a single sample.’
- ‘Several pools of syenitic magma were separated from the main body of the melt, each eventually being emplaced as quartz syenite, fayalite granite, and riebeckite granite.’
- ‘Associated with the fayalite are quartz, amphibole, and magnetite.’
Mid 19th century from Fayal(the name of an island in the Azores) + -ite.
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