lesleyite

noun

les·​ley·​ite

ˈleslēˌīt,

-ezl-

plural -s

: a mineral approximately K₂Al₈²/₃ Si₄O₂₀(OH)₄ consisting of a brittle mica that is related to margarite but contains potassium

Word History

Etymology

John Lesley, Jr., 19th century American on whose farm it was found + English -ite

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