Thortveitite
Thortveitite is a mineral consisting of scandium yttrium silicate 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.
A transparent gem quality example was found in 2004, and reported in "The Journal of Gemmology", 2008 Volume 31.
