Be wary of slate getting wet though…if the layers are at all accessible to water, then when heated they'll crack apart.
It's good as a bakestone, where it's kept dry and heated.
I'm pretty sure that years ago Match said that common house bricks worked well. Pretty easy to find bricks
….or those fancier pavers, maybe ? 
M…with visons of testing exploding rocks
, and having seen an awful lot of cooking stones that were shattered in the past due to thermal shock.
It's good as a bakestone, where it's kept dry and heated.
I'm pretty sure that years ago Match said that common house bricks worked well. Pretty easy to find bricks


M…with visons of testing exploding rocks
