Stoneiron

This spell causes stone weapons (flint, obsidian, and so on) to have the attack and damage scores of ordinary steel weapons, eliminating all penalties and higher chances of breaking. One large or two small weapons can be affected by each casting of this spell. Enchanted missiles lose their dweomer after striking their target; otherwise, the spell lasts 5 rounds per level of the caster. Repeated castings do not improve the weapon's abilities further.

The material component is a small chunk of stone of the same type as the weapon to be enchanted.