vauquelinite


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vauquelinite

[′vōk·lə‚nīt]
(mineralogy)
Pb2Cu(CrO4)PO4(OH) A monoclinic mineral of varying color, consisting of a basic chromate-phosphate of lead and copper.
References in periodicals archive ?
Berzelius described the dark green mineral that occurred in flattened crystals up to 5 millimeters, as vauquelinite.
Mammillary crusts of chrysocolla also underlie vauquelinite on old-time specimens.
Judging from the original description and from observations of later-recovered specimens, the associations include pseudomalachite (as blue or green nodules), some malachite, hemimorphite, white prisms of pyromorphite, ultramarine-blue microcrystalline masses of veszelyite, yellow and olive-green crusts of vauquelinite, libethenite (as acicular clusters, as small nodules with a radiating internal structure and also as equant to short prismatic crystals to 3 mm isolated on matrix), green pseudomorphs of reichenbachite after kipushite, quartz, and iron oxides.
Vauquelinite [Pb.sub.2][Cu.sup.2+](Cr[O.sub.4])(P[O.sub.4])(OH)
In addition to its type locality in the Urals, vauquelinite has also been reported from a fair number of other localities, among which is Musonoi in the western Kolwezi klippe.
The earliest report of yellow vauquelinite from Kipushi is in the kipushite assemblage (Piret et al., 1985).
Old-time specimens in collections consist of rough yellow clods to 2 mm and yellowish plates to 3 mm of vauquelinite pseudomorphs, probably after cerussite, scattered on a matrix of mammillary chrysocolla, with fibrous malachite complementing the association.
(1968) The crystal structure of vauquelinite and the relationships to fornacite.