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DESCLOIZITE , a rare See also: mineral See also: species consisting of basic See also: lead and See also: zinc vanadate, (Pb, Zn)2(OH)VO4, crystallizing in the orthorhombic See also: system and isomorphous with See also: olivenite
.
It was discovered by A: Damour in 1854, and named by him in honour of the French mineralogist See also: Des Cloizeaux
.
It occurs as small prismatic or pyramidal crystals, usually forming drusy crusts and stalactitic aggregates; also as fibrous encrusting masses with a mammillary See also: surface
.
The colour is deep See also: cherry-red to See also: brown or black, and the crystals are transparent or translucent with a greasy lustre; the streak is orange-yellow to brown; specific gravity 5.9 to 6.2; hardness 31
.
A variety known as cuprodescloizite is dull
See also: green in colour; it contains a considerable amount of copper replacing zinc and some arsenic replacing See also: Vanadium
.
Descloizite occurs in See also: veins of lead ores in association with See also: pyromorphite, See also: vanadinite, See also: wulfenite, &c
.
Localities arethe Sierra de Cordoba in See also: Argentina, Lake Valley in Sierra county, New Mexico, Arizona, See also: Phoenixville in Pennsylvania, and Kappel (Eisen-Kappel) near See also: Klagenfurt in See also: Carinthia
.
Other names which have been applied to this species are vanadite, tritochorite and ramirite; the uncertain vanadates eusynchite, araeoxene and dechenite are possibly identical with it
.
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