vanadinite

[vuh-nad-n-ahyt, -neyd-]
noun
a mineral, Pb 5 (VO 4 ) 3 Cl, occurring in yellow, brown, or greenish crystals: an ore of lead and vanadium.

Origin:
1850–55; vanad(ium) + -in2 + -ite1

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World English Dictionary
vanadinite (vəˈnædɪˌnaɪt)
 
n
a red, yellow, or brownish mineral consisting of a chloride and vanadate of lead in hexagonal crystalline form. It results from weathering of lead ores in desert regions and is a source of vanadium. Formula: Pb5(VO4)3Cl

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Encyclopedia Britannica
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vanadinite

vanadium mineral in the pyromorphite series of the apatite group of phosphates, lead chloride vanadate, Pb5(VO4)3Cl. It is a source of vanadium and a minor source of lead. The mineral's typical occurrences are as orange, red, or brown hairlike or barrel-shaped crystals in the oxidized zone of lead deposits as in the Urals, Russia; Transvaal, S.Af.; Chihuahua, Mex.; and Arizona, U.S. Endlichite is a highly arsenious variety; the complete substitution of arsenic for vanadium in the crystal structure forms the mineral mimetite. For detailed physical properties, see vanadate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Vanadinite occurs in vugs as granular aggregates of radiating prismatic crystals.
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