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Formula: (Bi,Pb)2(Fe3+,Fe2+)O2(OH)(PO4)
Phosphate, bismuth-bearing mineral
Crystal System: Monoclinic
Specific gravity: 6.83 calculated
Hardness: 4½
Streak: Light brown
Colour: Dark brown, black
Luminescence: Not fluorescent
Solubility: Soluble without effervescence in warm, dilute hydrochloric acid
Common impurities: Pb,Fe(II)
Environments
Localities
At the Schaar Shaft, Johanngeorgenstadt, Erzgebirgskreis, Saxony, Germany, brendelite forms tiny,
yellow-brown prismatic crystals on velvety goethite in a fissure in
phyllite
(MinRec 55.5.590).
At the type locality, the Güldener Falk Mine, Neustädtel, Schneeberg, Erzgebirgskreis, Saxony, Germany,
brendelite occurs as tabular to blocky crystals to 0.3 mm, and hemispheres with a radiating structure to
3 mm across. It is secondary, and very rare, in dump material
of the bismuth - cobalt -
nickel - silver deposit. Associated
minerals include pucherite,
petitjeanite,
neustädtelite, mixite,
eulytine,
cobaltneustädtelite,
bismutoferrite, bismutite,
beyerite and beudantite
(Mindat).
Brendelite from the Güldener Falk Mine -
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