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I have read on this forum that those stones do not make a good hearth. Use very big firebrick tiles. Like 12x12x2. Or even better, get soapstone. Get it in big thick sheets. There are a couple of members here who did. It is supposed to be like 6 times better than firebrick. Use the fancy stone for the vent landing.
I don't know about marble, but under direct heat, granite starts to spall, or explosively disintegrate causing large crystals to pop off. This rugged finish is attractive for stone steps but certainly not for keeping your pizzas and other food clean.