Definition of fayalite in English:

fayalite

noun

mass noun
  • A black or brown mineral which is an iron-rich form of olivine and occurs in many igneous rocks.

    • ‘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.’
    • ‘These minerals occur with manganoan fayalite and manganoan magnetite in a single sample.’
    • ‘Associated with the fayalite are quartz, amphibole, and magnetite.’

Origin

Mid 19th century: from Fayal(the name of an island in the Azores) + -ite.

Pronunciation

fayalite

/ˈfeɪəlʌɪt/