Baddeleyite

minerals

zircon

foshagite

weloganite

Images
Formula: ZrO2
Simple oxide of zirconium, baddeleyite group
Specific gravity: 5.4 to 6.02
Hardness: 6½
Streak: White to brownish white
Colour: Colourless to yellow, green, greenish or reddish brown, brown, iron-black; colourless to brown in transmitted light
Common impurities: Ca,Fe,Hf,Si,Ti
Environments

Plutonic igneous environments
Carbonatites
Gem gravels
Extraterrestrial environments

Baddeleyite occurs as an accessory mineral in carbonatites and kimberlites (Mindat, HOM), and in syenite, dolerite, gabbro and anorthosite (Mindat, HOM); it is detrital in gem gravels (Mindat, Webmin, HOM) and has also been found in lunar basalt, tektites and meteorites (Mindat, HOM, Dana).

Localities

At the Jacupiranga mine, Cajati, São Paulo, Brazil, baddeleyite occurs in an ultramafic plutonic rock with ilmenite, zirkelite, magnetite, apatite and perovskite (Dana, HOM).

At Axel Heiberg Island, Qikiqtaaluk Region, Nunavut, Canada, some samples of baddeleyite-bearing gabbro have been collected (AM 59.249-253).

At the Francon quarry, Montreal, Quebec, Canada, baddeleyite occurs very rarely as aggregates to 1 cm across in cavities rich in globular and powdery hematite. It is sometimes found as a powdery deposit on remnants of partially dissolved crystals of weloganite, and is probably derived from hydrothermal alteration of weloganite. Sometimes baddeleyite is intimately intergrown with grains of zircon. Baddeleyite is an intermediate to late-stage mineral associated with hematite, dawsonite, quartz, calcite, kaolinite, baryte, fluorite, ankerite, celestine, rarely weloganite and very rarely paratacamite (Minrec 37.1.20).

At Mount Somma, Italy, baddeleyite occurs in a sanidine-bearing rock with fluorite, nepheline, pyrochlore and allanite (Dana, HOM).

At the Palabora mine, Loolekop, Phalaborwa, Limpopo, South Africa, baddeleyite occurs in a carbonatite with magnetite, diopside, apatite and phlogopite (Dana AM 40.275-282). The carbonatites are composed of large irregular fragments of magnetite, calcite, chondrodite and apatite, with smaller amounts of phlogopite, chalcocite, chalcopyrite and thorianite. Baddeleyite is a minor constituent (AM 40.275-282).

At the Poços de Caldas alkaline complex, Minas Gerais, Brazil, baddeleyite occurs in a carbonatite (Dana).

At the type locality, Kollonnagam, Rakwana, Ratnapura District, Sabaragamuwa Province, Sri Lanka, baddeleyite occurs in gem gravels with zircon, tourmaline, spinel and several rare earth minerals (Dana).

At the Isabella Mine, Cripple Creek District, Teller county, Colorado, USA, baddeleyite has been reported as very small crystals in the groundmass of a phonolitic - tephrite dike (Minrec 36.2.163).

Near Bozeman, Gallatin county, Montana, USA, baddeleyite occurs in a corundum syenite (Dana)

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