Pyrochlore

oxide

primary

Pyrochlore is a group of minerals Formula: (Na,Ca)2Nb2(O,OH,F)2
Specific gravity: 4.5
Hardness: 5 to 5½
Streak: light brown, yellowish brown
Colour: orange, brownish red, brown, black
Solubility: Insoluble in water, soluble with decomposition in sulphuric acid

Plutonic igneous environments
Pegmatites
Carbonatites
Sedimentary environments

Pyrochlore is a primary mineral, forming in pegmatites and in igneous rocks dominated by carbonate minerals. It is an accessory mineral in silica-poor rocks, often occurring with magnetite, apatite and zircon. It also accumulates in some detrital deposits.

Common impurities: U,Th

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