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The Mineral and Gemstone Kingdom is a free informational and educational guide to rocks, minerals, gemstones, and jewelry. This site has been providing detailed information and photos of hundreds of mineral and gemstone since 1997 and is one of the leading education resources on minerals and gemstones.

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Recently Updated Minerals
columbite
1/19/2016
Ferrocolumbite: (Fe,Mn)(Nb,Ta)2O6
Manganocolumbite: (Mn,Fe)(Nb,Ta)2O6
Magnesiocolumbite: (Mg,Mn,Fe)(Nb,Ta)2O6
tantalite
1/19/2016
Ferrotantalite: (Fe,Mn)(Ta,Nb)2O6
Manganotantalite: (Mn,Fe)(Ta,Nb)2O6
Magnesiotantalite: (Mg,Mn,Fe)(Ta,Nb)2O6

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