Occasionally, enrichment in the unusual trace elements will result in crystallisation of equally unusual and rare minerals such as beryl, tourmaline, columbite, tantalite, zinnwaldite and so forth.
en.wikipedia.org Those minerals have the same chemical composition, but different crystal symmetry orthorhombic for tantalite or columbite and tetragonal for tapiolite.
en.wikipedia.org Economic activity is centered on mining, with the surrounding area containing approximately 100 million tonnes of minerals, including columbite, tin and tantalite.
en.wikipedia.org Associated minerals include quartz, feldspar, spodumene, amblygonite, tourmaline, columbite, cassiterite, topaz and beryl.
en.wikipedia.org It is a soft, grey, ductile transition metal, which is often found in the pyrochlore mineral, the main commercial source for niobium, and columbite.
en.wikipedia.org