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Thortveitite is a 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, Norwegian engineer. It is greyish-green, black or grey in color.

A transparent gem quality example was found in 2004, and reported in "The Journal of Gemmology", 2008 Volume 31.

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