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1 Types #10, #57 and #411 crushed granite average $0.50 per square foot. 2  The average cost per square foot of the highest-quality crushed granite is $0.76. 3  Types #2 and #1 of crushed granite average $0.76 per square foot as they are of the highest quality of rock.4  This cost estimate is for materials only. The average cost per square foot of the highest-quality crushed granite is $0.76. 2  Types #2 and #1 of crushed granite average $0.76 per square foot as they are of the highest quality of rock.
The cost of a granite countertop will, of course, depend on the size of your surface area. However, the average granite countertop will cost approximately $50 to $100 per square foot. In addition to the size, the cost will also depend on how thick you want the slab to be. One way to reduce the cost of a granite countertop is by purchasing your choice through a wholesaler.