Honestly, there's really nothing incredibly special about Adam Jones' tone itself. You can dial in something similar with any half-decent rock amp. I'd start with Marshalls since his tone is more mid-focused.
The distinctive thing about what he's doing has to do with HOW he plays. His pick attack, all of the little bends and effects and things he does, the interaction with the bass, are what makes it sound like Tool. He could probably use almost any amp (or amps) and sound like that. That's the thing about great players: it's not the specific gear they're using, it's the way they approach the instrument.