Pyrochlore
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Pyrochlore 2Nb2O6 is a mineral group of the niobium end member of the pyrochlore supergroup. Pyrochlore is also a term for the crystal structure Fd3m. The name is from the Greek πῦρ, fire, and χλωρός,
Pyrochlore from Russia
Metamictisation
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Metamictisation is a natural process resulting in the gradual and ultimately complete destruction of a mineral's crystal structure, leaving the mineral amorphous. The affected material is therefore de
Pyrochlore
…crystals are usually well-formed (euhedral), occurring usually as octahedra of a yellowish or brownish color and resinous luster. It is commonly metamict due to radiation damage from included radioactive elements. Pyrochlore occurs in pegmatites associated with nepheline syenites and other alkalic rocks…
Metamict grey-black Th-uranitite (or possibly davidite) on granitic gneiss from Crokers Well, Olary, South Australia