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

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!