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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.
(Minerals) another name for barytes
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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|Noun||1.||heavy spar - a white or colorless mineral (BaSO4); the main source of barium|
atomic number 56, Ba, barium - a soft silvery metallic element of the alkali earth group; found in barite
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
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