Glassteel

The glassteel spell turns normal, nonmagical crystal or glass into a transparent substance that has the tensile strength and unbreakability of actual steel. Only a relatively small volume of material can be affected (a maximum weight of 10 pounds per level of experience of the spellcaster), and it must form one whole object. The Armor Class of the substance is 1. The material components of this spell are a small piece of glass and a small piece of steel.