Hashemite is stoichiometrically similar to crocoite and chromatite. It occurs also as the mineral crocoite. It is considered to be possibly a mixture of crocoite, mimetite and quartz. In 1794, Louis Nicolas Vauquelin received samples of crocoite ore. He produced chromium trioxide (CrO) by mixing crocoite with hydrochloric acid. Crocoite is also the official Tasmanian mineral emblem.