Crookesite Crookesite Crookesite is a selenide mineral composed of copper and selenium with variable thallium and silver. Its chemical formula is reported either as Cu(Tl,Ag)Se or (Cu,Tl,Ag)Se. It is formed by precipitation from hydrothermal fluids, and contains by mass: 16.3% Tl, 47.3% Cu, 2.9% Ag, and 33.6% Se. Crookesite is an opaque, bluish grey to pink toned brown metallic mineral crystallizing in the tetragonal system. It has a Mohs hardness of 2.5 to 3 and a specific gravity of 6.9. It was discovered in 1866 in Skrikerum, Sweden and named for Sir William Crookes (1832–1919), the discoverer of the element thallium.
Element Eighty Element Eighty Element Eighty was a four-piece nu metal band from Tyler, Texas. The band formed in 2000. The band split in 2006, only to be reunited a few months later in 2007. Their first album was named after the chemical element mercury, which has number eighty in the Periodic Table of the Elements. Element Eighty formed in 1998, and self-released their debut album "Mercuric" on June 21, 2001. In April 2003, the band signed a deal with Universal/Republic Records. Their self-titled album "Element Eighty" was released on October 28, 2003. The band toured with such artists as Sevendust, Mudvayne,