Columbite Niobite-Tantalite rare earth metals Niobium ore mineral Crystal Specimen. Big black crystals in Microcline with pale green muscovite
Dimensions (millimeters): 90 x 80 x 35
Dimensions (inches): 3.5 x 3.1 x 1.4
Origins: mined at Globe Mine, Rio Arriba County, New Mexico
The minerals tantalite and columbite (Fe,Mn)(Nb,Ta)2O6 are sources of tantalum and niobium. They are so chemically similar that they are often grouped together and called coltan
All Mineral Specimens and Geological Samples come with a label with the name of the mineral and where it was mined
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