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Formula: PbZn(AsO4)(OH)
Anhydrous arsenate containing hydroxyl,
adelite-descloizite group
Crystal System: Orthorhombic
Specific gravity: 6.57 calculated
Hardness: 4
Streak: White
Colour: Pale yellow to deep green, greyish brown
Environments
Arsendescloizite occurs as a secondary mineral in oxidised
hydrothermal polymetallic deposits (Webmin).
Localities
At the type locality, the Tsumeb mine, Tsumeb, Oshikoto Region, Namibia, arsendescloizite occurs in the oxidised zone of
a polymetallic ore arsenic-bearing sulphide deposit. The mineral is
associated with
willemite, chalcocite,
mimetite, quartz and
goethite, on a matrix of
tennantite and
chalcocite
(AM 68.280).
At the Tonopah-Belmont mine, Belmont Mountain, Tonopah, Osborn Mining District, Maricopa county, Arizona, USA,
arsendescloizite has been found as minute, bladed, olive-green crystals, approximately 0.1 mm in size. It is
often
associated with goethite in samples containing
linarite, but linarite and
arsendescloizite have not been found immediately together.
(R&M 87-2.179).
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