Wickenburgite

wickenburgite

shattuckite

luddenite

phoenicochroite

Images

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).

Localities

At the type locality, the Potter-Cramer Mine, Vulture Mining District, 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).
It fluoresces best under SWUV, typically medium red, but it can also fluoresce pink, red and deep crimson, all on the same specimen. It is possible that the activator is Mn2+ with a co-activator of lead (R&M 96.1.36-37).

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