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polianite

[poh-lee-uh-nahyt]

noun Mineralogy.

a variety of pyrolusite, MnO2, having well-developed crystals.

Origin of polianite

1840–50; < German Polianit, irregular < Greek poliaínesthai to grow white (with sea foam), derivative of poliós gray; see -ite¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019