The answer depends on how deep the granite is meant to be.
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Probably none because a slab of granite would be measured in cubic feet.
4,495.5 lbs on the average.Granite weighs and average of 165.5 pounds per cubic foot (thanks to Special:Contributions). With 29 cubic feet in a cubic yard we come up with 4,495.5 lbs. Given different densities from the types of granite this could be more or less dependant on the type of granite.
100 cubic feet for every foot of depth.
that is 333 cubic feet,or 12.3 cubic yards At 100 pounds per cubic foot,that is over 33,000 pounds of gravel
300 square feet x 1/2 foot = 150 cubic feet1 cubic yard = 27 cubic feet150 cubic feet = (150 / 27) = 5 - 5/9 = 5.555cubic yards (rounded, repeating)