Manganotantalite
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Physical & Optical Properties
Mohs Hardness
Crystal System
Value & Market
Where to Buy Manganotantalite
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About Manganotantalite
Manganotantalite is a manganese tantalum oxide mineral in the columbite-tantalite series, forming dark reddish-brown to black prismatic crystals with a submetallic to adamantine luster and a high density. It occurs in granitic and alkaline pegmatites and is found in localities in Brazil, Australia, Mozambique, and Afghanistan, often as an ore of tantalum. Rare reddish-brown transparent crystals from Brazil have been faceted into collector gems notable for their high refractive index and unusual deep color.