Can obsidian be used for building?

I'm not talking about Minecraft either lol, I mean in real life, could it be possible to use obsidian to build something sturdy like a wall? I know nothing about obsidian honestly but, whenever I look it up all I get is video game stuff. If not obsidian, what's another type of natural rock that could be used for making a very thick sturdy wall?

Obsidian, contrary to it's minecraft persona, is actually very weak material, and crumbles with little stress. Wouldn't want to build with it.