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A yellow or yellowish-green mineral, essentially WO3, often occurring with tungsten ores.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Elements & Compounds) a yellow earthy rare secondary mineral that consists of tungsten oxide and occurs with tungsten ores. Formula: WO3
[C20: from tungst(en) + -ite1]