A black or brown mineral that 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) + -ite1.
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