Oxyplumboroméite

oxyplumboromeite

calcite

leucophoenicite

tephroite

Images

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

Metamorphic 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 Mariquita Mine (Sultana Mine), Usagre, Badajoz, Extremadura, Spain, oxyplumboroméite occurs as massive, earthy, ochre-yellow material associated with malachite, quartz, brochantite and cinnabar. Oxyplumboroméite is rare, possibly because antimony sulphosalts, from which it alters, are rare in the primary mineralisation (MinRec 55.4.505).

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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