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polianite

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

noun

Mineralogy.
  1. a variety of pyrolusite, MnO 2 , having well-developed crystals.


Etymology

Origin of polianite

1840–50; < German Polianit, irregular < Greek poliaínesthai to grow white (with sea foam), derivative of poliós gray; see -ite 1

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