Topazi ni madini ambayo kikemia fomula yake ni Al2SiO4(F,OH)2. Ni kati ya madini magumu zaidi (8/10). Kutokana na ugumu na uangavu wake, pamoja na rangi zake mbalimbali, imetumika sana kama kito. Inatajwa na Biblia pia. Wikimedia Commons ina media kuhusu: Topazi Topaz Archived 14 Februari 2017 at the Wayback Machine.—International Colored Gemstone Association Topaz and other minerals found at Topaz Mountain, Juab County Archived 27 Agosti 2013 at the Wayback Machine., Utah Geological Survey