Pyrochlore is  a complex oxide mineral, (Na,Ca)2Nb2O6(OH,F). It is  as a solid solution between the niobium end member (pyrochlore), and the tantalum end member (microlite).  Pyrochlore crystals are usually well formed (euhedral) crystals, occurring usually as octahedra of a yellowish or brownish color and a resinous luster. Sub-translucent to opaque It can also be dark reddish or blackish brown.  

Pyrochlore is brittle with a hardness of 5 - 5.5 on the Mohs scale and a density of 4.2 to 4.36. 

It was first described in 1826 for an occurrence in Stavern in Norway. Read More...

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Pyrochlore-01- Oka Niobium Mine Canada
Red-brick octaedrons of Pyrochlore crystals in a carbonatite matrix. Oka Niobium m..
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Pyrochlore-02- Oka Niobium Mine Canada
Pyrochlore and Magnetite in carbonatite, Oka Niobium mine in Oka, Deux-Montagnes RCM, Laurentid..
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