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willemite

[wil-uh-mahyt] /ˈwɪl əˌmaɪt/
noun
1.
a mineral, a zinc silicate, Zn 2 SiO 4 , sometimes containing manganese, occurring in prismatic crystals or granular masses, usually greenish, sometimes white, brown, or red: a minor ore of zinc.
Origin of willemite
1835-1845
1835-45; named after King Willem I; see -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for willemite

willemite

/ˈwɪləˌmaɪt/
noun
1.
a secondary mineral consisting of zinc silicate in hexagonal crystalline form. It is white, colourless, or coloured by impurities and is found in veins of zinc ore. Formula: Zn2SiO4
Word Origin
C19: from Dutch willemit, named after Willem I of the Netherlands (1772–1843)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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