Clean quartz sand weighs 80-125 pounds per cubic foot depending on degree of compaction and moisture content.
A cubic yard is made up from 27 cubic feet. So taking a value of about 100 pounds of sand per cubic foot, 1 cubic yards of sand would weigh 2700 pounds or 1.35 ton [short, US].
Thus 4/1.35 = 2.963
So 4 short, US tons of sand would occupy a volume of 2.963 cubic yards.
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