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pyrochlore
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nature : F CaNb2 O6 called yellow-green stone. Nb2 O5 containing 56%. When niobium mainly tantalum replacement, became small Guaranty. Often containing tantalum, rare earth elements, uranium and so on. Equiaxed crystal. Crystal was octahedron, most of the irregular or dense granular massive clusters. Brown or yellow-green, there are a few black. Traces of pale yellow or light brown. Resin luster. Hardness 5.0-5.5. Melt fracture. Density 4.12-4.36. With strong radioactive. Produced in the basic rocks, pegmatite or carbonate rock, often with zircon, apatite, perovskite and other symbiotic. The extraction of rare earth elements, niobium, tantalum and radioelement important mineral raw materials.


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4) Pyrochlore structure
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