One of the mysteries of the English language finally explained.
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.
Early 19th century. From German Margarit from Hellenistic Greek μάργαρον pearl + German -it.
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