autunite

autunite

[awt-n-ahyt, oh-tuhn-ahyt]
noun
a yellow mineral, a hydrous calcium uranium phosphate, CaU 2 P 2 O 12 ⋅8H 2 O, 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 -ite1

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autunite (ˈɔːtəˌnaɪt)
 
n
a yellowish fluorescent radioactive mineral consisting of a hydrated calcium uranium phosphate in tetragonal crystalline form. It is found in uranium ores. Formula: Ca(UO2)2(PO4)2.10--12H2O
 
[C19: named after Autun in France, one of the places where it was found, + -ite1]

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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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