Jeremejevite

This hard-to-find mineral is usually clear, blue or yellow, and almost always seen in tiny crystals. It also displays the same piezoelectric properties as Quartz, and is named after the Russian mineralogist Jeremejev after its discovery in the Russian mountains in 1883. Only a tiny amount of crystals have ever been found large enough to be faceted, and prices can fetch up to $2,000 per carat