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Definition of mackayite in English:

mackayite

Pronunciation /məˈkʌɪʌɪt/ /ˈmakiʌɪt/

noun

Mineralogy

  • A green, tetragonal, hydrated tellurite of ferric iron, FeTe₂ O₅ (OH), occurring as pyramidal to short prismatic crystals.

Origin

1940s. From the name of John W. Mackay + -ite.