Thortveitite is a rare mineral primarily composed of titanium and silicon, with the chemical formula Y2Si2O7. It typically forms in metamorphic rocks and is often found in regions with high levels of yttrium. The mineral is known for its distinctive green to brown color and glassy luster. Thortveitite is of interest to mineral collectors and researchers due to its unique properties and rarity. It can be used in various applications, including electronics and ceramics, because of its semiconducting characteristics. The mineral is named after the Norwegian mineralogist Thorvald Thortveit.