not sure if this is the right home for this post...but ive been looking into getting a baking stone..

is it o.k. to use a marble tile (kind of like ones youd lay counters with) or piece of slate or something... (trying to see what i can find as scrap to use for it..after being well sanitized of course...)

the one they had at wal-mart was only for pizza and id like to try to find one that covers the whole space of the rack in my oven (so i can bake moooooore bread of course!)

any ideas>??

thank much!!