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.
CU Independent are about 20 section editors who assign stories to reporters and work with the visual staff to produce photographs, videos, and graphics. A managing editor and an editor-in-chief oversee the website. The "CU Independent" received four regional awards from the Society of Professional Journalists in 2014, including "Best Digital-Only Student Publication." The "CU Independent" was founded in 1978 as the "Working Press" but soon adopted the name "Campus Press." It was launched by Mal Deans, a CU journalism instructor, to serve as a student-run newspaper after the Colorado Daily left campus and became a community newspaper. The "Campus Press" published