Closest Statted Material to Obsidian in D&D 3.5?

[Kevingway]

Bilestone is a material in Lords of Madness that is said to have qualities similar to obsidian; however, I'm unsure how one would go about statting up, for example, an obsidian-esque weapon. What stone-like materials would function like obsidian/bilestone that have non-homebrewed qualities and could be used as weapons/armor?

Just seems like a cool idea to wield equipment that's forged from the dung of an Elder Evil.

[Yomega]

Pathfinder has Obsidian

[Phelix-Mu]

Check out the 3.5 Dark Sun stuff at Athas.org. They should have stats for obsidian weapons, as actual metal is vanishingly rare on Athas. All their stuff is officially licensed, and so has the WotC stamp of approval on it, for what it's worth. So it should be regarded as pretty close to 1st party material (though some DMs will likely judge otherwise for setting purposes).

[Psyren]

Pathfinder has Obsidian

Indeed, you can use these stats as much as you want as they are open content.

[shaikujin]

There's also Blood Glass from Secret of Xendrik (my spelling may be off).

It's obsidian, but with traces of dragonshards.

Sharp (+1 damage to slashing and piercing weapons). But has low hardness and HP. Vulnerable to Shatter spells.

Can be enchanted with a WSA called Shifting that has a 3,000 gp flat cost (functionally similar to the +1 Morphing WSA).

A way to save costs if a morphing weapon is desired.