Generally it comes in two sizes.
Unglazed porcelain tile pizza stone.
Most of what you are going to find is going to be red and about one half of an inch thick.
Now glazed tile often has lead in it so you want to be careful to get an unglazed slab.
I prefer the pizza stone as i can also use it for its intended purpose.
6 x 6 11 x 11 you will want to choose unglazed tiles that are at least inch thick although 1 is better.
But one of the advantages of baking stones and quarry tiles is that they are unglazed and thus allow moisture to pass out of the bread bottom for better crisping.
Unglazed quarry tile do not have this limitation.
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Treesap 4 years ago i believe khurram was referring to the pampered chef pizza stones when speaking of those recommendations.
If you decide to use quarry tiles make sure you buy unglazed quarry tiles the shiny glazing is not applied to this type of tile which allows the tiles to draw moisture out of the pizza crust making it crispy unglazed quarry tile stones tiles steel pans accessories pizza making forum.