Hydroxyplumbopyrochlore

hydroxyplumbopyrochlore

hydropyrochlore

fluornatropyrochlore

samarskite-(Y)

Images

Formula: (Pb1.50.5)Nb2O6(OH)
Oxide, pyrochlore group, niobium-bearing mineral
Specific gravity: 6.474 calculated
Hardness: 5½
Streak: White
Colour: Pale yellow to pale brown
Luminescence: Non-fluorescent in UV
Environments

Plutonic igneous environments
Pegmatites

Localities

At the type locality, the Jabal Sayid mine, Medina Region, Saudi Arabia, hydroxyplumbopyrochlore has been discovered in pegmatite-aplite rocks of the peralkaline granitic complex. It is associated with quartz, microcline, biotite, rutile, zircon, calcite, rhodochrosite, columbite-(Fe), goethite, thorite, bastnäsite-(Ce), xenotime-(Y), samarskite-(Y), euxenite-(Y), hydropyrochlore and fluornatropyrochlore. Hydroxyplumbopyrochlore usually shows pale yellow to pale brown, euhedral octahedra, slightly rhombic dodecahedra and cubes or their combination (0.01–0.06 mm) (MM 84.5.785-790).

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