So I have an idea about a material in Athas. While yes, bone, stone, and wood make fine armor and weapons for the Athasians, I thought of something that could be uniquely Athasian- sun glass. In the very deepest reaches of the desert, where there is not but sand and the sun, the heat eventually turns the surface sand into glass; but not the fragile break-able glass that we know in our world, or in other fantasy worlds. This glass is stronger than wood, bone, or stone for weapons and armor, but not quite as strong as metal. Merchant houses have whole expeditions into the desert to collect one large sheet of sun-glass, which I imagine would come in sizes of around 10 feet by 10 feet or so, maybe larger. This glass is then shaped into weapons, armors, and tools by glass-singers, who use a combination of the right wavelengths of sound from their voice and instruments and psionic powers to mold the glass.
Sun-glass armor and weapons, if you're using a weapon breakage rule, if they were to break, the character would have to roll to hit again; if they miss the attack, then the weapon breaks. If they hit, they still don't do any damage, but the weapon doesn't break. I'm also using an armor-breakage rule for any attack that could damage armor; if the enemy attacking gets a natural 20 on their attack, the AC of the armor goes down by 1. Glass armor, the enemy has to roll again to hit to see if they break the armor. If they hit, the armor breaks and the AC goes down. If they miss, it doesn't.
What do you think?