[bair-ahyt, bar-]
a common mineral, barium sulfate, BaSO 4 , occurring in white, yellow, or colorless tabular crystals: the principal ore of barium.
Also, barytes.
Also called heavy spar.

1780–90; bar(ytes) + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
barite (ˈbɛəraɪt)
(US), (Canadian) barytes, Also called: heavy spar a colourless or white mineral consisting of barium sulphate in orthorhombic crystalline form, occurring in sedimentary rocks and with sulphide ores: a source of barium. Formula: BaSO4
[C18: from bar(ium) + -ite1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
barite   (bâr'īt)  Pronunciation Key 
A usually white, clear, or yellow orthorhombic mineral. Barite occurs as flattened blades or in a circular pattern of crystals that looks like a flower and, when colored red by iron stains, is called a desert rose. It is found in limestone, in clay-rich rocks, and in sandstones. Barite is used as a source of barium. Chemical formula: BaSO4.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Barite solubility is lowest in oxidized soils that are rich in sources of
  soluble sulfate such as gypsum.
Distal barite-fluorite veins consist of variable proportions of barite,
  fluorite, and manganese oxides.
Barium is obtained through the mining of crude barite ore, which contains
  mostly barium sulfate.
Information gathered on manganese, barite, and iron are not included in this
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