This sample of stibiotantalite is displayed in the Smithsonian Museum of Natural History. Stibiotantalite is a oxide mineral of antimony and tantalum. It has the composition SbTaO4. This sample is about 10x10 cm and is from Alto Ligonha pegmatite district, Niassa, Mozambique.
Stibiotantalite is sometimes of gem quality. The left gem is 7.3 carats and is from Brazil. The right gem is 2.5 carats and is from the Alto Ligonha pegmatite district, Niassa, Mozambique.