Wickenburgite

phyllosilicate

phoenicochroite

Formula: Pb3CaAl2Si10O27.4H2O
Phyllosilicate (sheet silicate)
Specific gravity: 3.85
Hardness: 5
Streak: White
Colour: Colourless to white, rarely pink
Environments:

Sedimentary environments
Metamorphic environments
Hydrothermal vein environment

Wickenburgite occurs in oxidised lead-bearing hydrothermal veins associated with phoenicochroite, mimetite, cerussite, willemite, crocoite, duftite, hemihedrite, alamosite, melanotekite, luddenite, ajoite, shattuckite, vauquelinite, descloizite and laumontite (HOM).

At the type locality, Wickenburg, Maricopa county, Arizona, USA, wickenburgite occurs as an oxide zone mineral in a vein which originally carried galena and sphalerite in a gangue consisting largely of quartz and fluorite, associated with phoenicochroite and mimetite, with lesser amounts of cerussite, willemite, crocoite, duftite, hemihedrite, ajoite, vauquelinite, descloizite, laumontite and shattuckite. Wickenburgite is by far the most abundant of these minerals and was among the last to crystallise (AM53.1433).

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