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polianite

[poh-lee-uh-nahyt] /ˈpoʊ li əˌnaɪt/
noun, Mineralogy
1.
a variety of pyrolusite, MnO 2 , having well-developed crystals.
Origin
1840-1850
1840-50; < German Polianit, irregular < Greek poliaínesthai to grow white (with sea foam), derivative of poliós gray; see -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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