Thortveitite

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Thortveitite
Thortveitite-ea14a.jpg
Thortveitite
General
Category Mineral
Formula
(repeating unit)
(Sc,Y)2Si2O7
Identification
Crystal system orthorhombic
Mohs scale hardness 5-6
Luster vitreous
Streak gray
Specific gravity 3.3-3.8

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 Gemology", 2008 Volume 31.

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