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Niobium is associated with two types of mineralization in igneous rocks: in carbonatites and in certain alkaline or hyperalkaline intrusions, such as syenites. [url=Source and geological context of mineralizations Niobium is associated with two types of mineralization in igneous rocks: in carbonatites and in certain alkaline or hyperalkaline intrusions, such as syenites.][/url] All the best! Java
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