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autunite

 - 3 dictionary results

au⋅tun⋅ite

  [awt-n-ahyt, oh-tuhn-ahyt]
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–noun
a yellow mineral, a hydrous calcium uranium phosphate, CaU2P2O12·8H2O, occurring in crystals as nearly square tablets: a minor ore of uranium.
Origin:
1850–55; named after Autun, city in E France near source of supply; see -ite 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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au·tun·ite   (ō-tŭn'īt', ô'tə-nīt)   
n.  A yellowish, fluorescent minor ore of uranium with the composition Ca(UO2)2(PO4)2·10-12H2O.

[After Autun, a city of east-central France.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia

autunite

phosphate mineral, hydrated calcium and uranium phosphate [Ca(UO2)2 (PO4)210-12H2O], that is an ore of uranium. It forms translucent to transparent, yellow to pale-green crystals, scaly masses, or crusts in hydrothermal veins and pegmatites, where it occurs as an alteration product of uraninite. It has been found in Cornwall, Eng.; Katanga, Congo (Kinshasa); and the northwestern United States. For detailed physical properties, see phosphate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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