Quartz
silicon dioxide
SiO2
Amethyst Geode with Agate Shell and a Single Clear Quartz Crystal
Dugway Geode Beds, Utah
Collected on 27 Aug 2006
Quartz Geode
Harrodsburg, Indiana
Collected on 11 Sep 2006
Quartz Stalactite
Aspen Mine, near Silverton, Colorado
Collected on 5 Oct 2008
Drusy Quartz on Quartz Crystals
Revenue Mine, Ouray, Colorado
Collected on 7 Oct 2008
Closeup of Drusy Quartz on Quartz Crystals
Revenue Mine, Ouray, Colorado
Collected on 7 Oct 2008
Small Quartz Vug
Crystal Hill Mine, La Garita, Colorado
Collected on 10 Oct 2008
Closeup of Quartz Geode
Keokuk, Iowa
Collected on 1 Aug 2006