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Molecular formula : CaNaNb2O6F CAS :
nature : also known as yellow-green stone. Often containing tantalum, uranium and other elements. Equiaxed crystal. Crystal was octahedron. Usually into massive granular or collectivities. Mok's hardness of 5 to 5.5. The relative density of 4.03 to 4.36. N1.93 refractive index ~ 2.03 translucent to opaque. Resin luster. Brown, black or yellow-green, fresh fracture was almost black. Traces of pale yellow or light brown. Sexual crisp. Cleavage parallel octahedral incomplete. Fracture desert. With strong radioactive. Often produced in the alkaline rocks, basic pegmatite or carbonate rocks. The extraction of rare earth elements, niobium, tantalum and radioactive elements of the mineral raw materials.
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