Topaz
hydrous aluminum silicate
Al2SiO4(F, OH)2
Topaz on Rhyolite Matrix
Topaz Mountain, Thomas Range, Utah
Collected on 16 May 2001
Topaz Cluster
Topaz Mountain, Thomas Range, Utah
Collected on 26 Aug 2006
Topaz and Bixbyite
Topaz Mountain, Thomas Range, Utah
Collected on 26 Aug 2006