Columbite-Tantalite Series
The columbite-tantalite series is two minerals that contain oxygen with niobium and tantalum;
columbite contains more niobium, and tantalite contains more tantalum. Both of these minerals
are black and weakly magnetic. They are commonly found in granite pegmatites, along with
minerals including corundum and quartz. Large deposits of these minerals are located in western
Australia, Brazil, and Norway. Columbite and tantalite are important sources of niobium and
tantalum.
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