Nothing that's glass, or has glass in it. Most glazed tiles will be really slippery for them. Talk to the associate of waterever store you go to, tell them that you're putting it in a reptile enclosure so you need to make sure that the tile can be very close to heat, and absorb it, not reflect it.
Most tiles that are ceramic will not reflect heat, so any of those would be fine. I am not positive about porceline tiles, and any type of slate tile would do just fine.
Just make sure to run your hand and even nails along the tile to make sure it's not super slippery.