1st Ed PHB said:Glassteel (Alteration)
Level: 8
Range: Touch
Duration: Permanent
Area of Effect: Object touched
Components: V,S,M
Casting Time: 8 segments
Saving Throw: None
Explanation/Description: The glassteel spell turns crystal or glass into a transparent substance which has the 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 spell caster and it must form one whole object. The material components of this spell are a small piece of glass and a small piece of steel.
Question said:I believe its in an FR book somewhere. Its basically a significantly more costly version of mithral(i think it has the exact same mods), that is transparent(wait if you make a full plate out of this doesnt that mean they can see through it?), and has better hardness(i think).
Question said:Okay i am looking at the version in champions of valor.
Its basically mithral with hardness 20 and 40 hp per point of thickness. Light armor +2k, med armor +6k, heavy armor +12k.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.