Definition of margarite in US English:

margarite

noun

  • 1Mineralogy. A calcium aluminium silicate of the mica group, CaAl₄Si₂O₁₀(OH)₂, usually occurring as minute scales with a pearly lustre. Formerly also called pearl mica.

  • 2Geology A line of globulites resembling a string of pearls, commonly occurring in glassy igneous rocks.

Origin

Early 19th century. From German Margarit from Hellenistic Greek μάργαρον pearl + German -it.

Pronunciation

margarite

/ˈmɑːɡərʌɪt/