在自然界,既可以见到云母和花岗岩中铌、钽含量都高;也可以见到铌、钽只在云母中含量高.而在花岗岩中含量低的现象,其原因,首先是花岗岩形成条件的不同,而影响到花岗岩和云母中铌、钽的行为、含量及其相关关系;其次是铌、钽的赋存形式在性质上和数量上的不同,使它们之间的关系复杂化了。 In nature, both niobium and granite can be seen in both niobium and tantalum content is high; also can see niobium, tantalum in mica content is high, while the low content of granite phenomenon, the reason, first of all, the formation of granite conditions Which affect the behavior and content of niobium and tantalum in granite and mica. The second is the difference in nature and quantity between niobium and tantalum, complicating the relationship between them.