Thortveitite is a rare mineral consisting of scandium yttrium silicate (Sc,Y)2Si2O7. It is the primary source of scandium. Occurrence is in granitic pegmatites. It was named after Olaus Thortveit, a Norwegian engineer. It is grayish-green, black or gray in color.[1][2][3][4]
A transparent gem quality example was found in 2004, and reported in "The Journal of Gemmology".[5]
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