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Formula: Pb2Sb2O7
Oxide, roméite group,
pyrochlore supergroup, forms
series with fluorcalcioroméite and with
roméite, antimony-bearing mineral
Crystal System: Isometric
Specific gravity: 6.732 calculated
Hardness: 5
Streak: straw-yellow
Colour: Yellow to brownish yellow
Common impurities: Ca,Fe(III),Mn,Na
Environments
Localities
At the Esperanza Mine, Kaminiza mines, Km 3, Lavrion Mining District, Lavreotiki, East Attica, Attica, Greece,
nickeltsumcorite was found in the oxidation zone of a hydrothermal orebody
containing gersdorffite and
galena. Associated minerals include
annabergite,
nickellotharmeyerite,
nickelaustinite, gaspéite,
calcite, dolomite,
aragonite, quartz,
goethite, cerussite,
arseniosiderite, mimetite,
oxyplumboroméite and manganese oxides/hydroxides
(MM 80.2.337–346).
At the type locality, the Harstigen mine, Pajsberg, Persberg ore district, Filipstad, Värmland County, Sweden,
oxyplumboroméite
is found together with calcite and
leucophoenicite in fissure fillings in
tephroite skarn. It occurs as yellow to
brownish yellow
rounded grains or imperfect octahedra
(MM 77.2931-2939).
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