Glass used quartz sandstone in Ershan area occurred in Liguan group of Cambrian Changqing group with layer type. It has one layer. Due to the folding structure development and longterm weathering and denudation, it has been divided into 5 ore bodies. Ore quality is good without interlayer. Its average components are as follows: SiO2 is 96.46%, Al2O3 is 0.84% and Fe2O3 is 0.21%. Ore quality is good. The deposit belongs to stratabound littoral terrigenous clastic sedimentary deposit.