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polianite

[poh-lee-uh-nahyt]
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noun Mineralogy.
  1. a variety of pyrolusite, MnO2, having well-developed crystals.
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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. 2018