polianite

[ poh-lee-uh-nahyt ]
/ ˈpoʊ li əˌnaɪt /

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