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Thortveitite is a known as a mineral, scandium yttrium silicate (Sc,Y)2Si2O7, being the main ore source of scandium, but in 2004, a gem example was found.
This newly discovered gemstone was reported in "The Journal of Gemmology", 2008 Volume 31, Nos 1/2.

Technical Details
Chemical Composition and Name(Sc,Y)2Si2O7 - Scandium Yttrium Ailicate
Hardness7 (estimated)
Specific Gravity3.48
Refractive Index (R.I.)1.753 - 1.809
Optic SignNegative
Optical CharacterBiaxial

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