Thortveitite

 ( Scandium Minerals ) 

Thortveitite is a rare mineral consisting of scandium yttrium silicate (Sc,Y)₂Si₂O₇. It is the most widespread scandium mineral, but natural thortveitite is not widely exploited as a source of scandium metal. Most scandium is derived from mine tailings, which can include thortveitite. Thortveitite mining in the United States ceased in 1969.

Occurrence is in granitic . It was named after Olaus Thortveit, a Norway engineer. It is grayish-green, black or gray in color.

A transparent gem quality example was found in 2004, and reported in The Journal of Gemmology.

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