The only way this question would make sense is to ask the weight of one cubic meter of granite, and that would vary according to the composition of the granite, but think in terms of about
2,000 kilos, give-or-take.
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It is 0.03 cubic metres, so would be about 0.03 x 5000 kilograms, 150 kg.
Any amount you like. You can vary the thickness of the granite to get any mass per square metre. A super-thin wafer could weigh micrograms per sq metre while a block of granite several kilometres high but only 1 sq metre in cross section could have a mass of tons.
The weight of 4.2mm Aluminium Checker Plate is 1.02 Pounds/ Square Foot OR 4.98kg/ Square meter.
Grams are a measure of weight, a square meter is a measure of area, and a cubic meter is a measure of volume. These are not comparable.
25KG