This page has information about the materials used for windows in space vehicles and outer-space applications.

The cupola on the ISS uses fused quartz borosilicate window panes.

• see https://space.stackexchange.com/questions/3830/what-materials-are-the-windows-on-the-us-segment-of-the-iss-made-out-of

Good article on fused silica strength and material properties for space use:

• Transparent Armor Ceramics as Space Windows

Material availability [edit section]

Silicon and Oxygen are the two most abundant materials in the moon's crust.