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Formula: PbFe3+2(AsO4)2(OH)2
Hydrated normal arsenate,
tsumcorite group,
paramorph of carminite
Crystal System: Monoclinic
Specific gravity: 5.53 calculated
Hardness: 4
Streak: Orange-yellow
Colour: Orange-brown, red-brown
Environments:
The formation of mawbyite is probably related to the acidity of circulating waters in the oxidation zone
(Dana).
Localities
At the type locality, the Kintore opencut, Broken Hill South Mine, Broken Hill, Broken Hill district, Yancowinna
New South Wales, Australia, mawbyite occurs in the oxidised zone of a metamorphosed stratiform
lead-zinc orebody in fractures and cavities
in granular spessartine quartz rocks
in an arsenic-rich reaction halo. Associated minerals include
corkite-beudantite,
adamite-olivenite,
duftite, mimetite,
bayldonite, hidalgoite,
pharmacosiderite, segnitite and
iron-manganese oxides. Mawbyite
crystals are usually dogtooth to prismatic, more rarely tabular, up to 0.2 mm long
(AM 74.1377-1381, HOM).
At the Bali Lo copper mine, Ashburton Downs Station, Ashburton Shire, Western Australia, mawbyite occurs in veinlets
in tennantite, as crystal clusters, and as a component of the larger vein-like
masses, where it tends to be associated with gartrellite and
olivenite
(AJM 13.1.35-37).
At the Moldava deposit, Moldava, Teplice District, Ústí nad Labem Region, Czech Republic, mawbyite occurs in the
oxidation zone of
silver-lead-copper-bismuth
mineralisation in
fluorite–baryte–quartz
veins. Associated minerals include mimetite,
philipsbornite and thometzekite
(HOM ).
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