Brass is an alloy of copper and zinc. The relative proportions are varied to make brass with different properties. The different mixes result in different densities, but they are close to 0.3 pounds per cubic inch.
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2.54 grams/cubic inch
13.6 grams/ccSame as the density of 1 cc, 72 pounds, 5 gallons, or a school-bus full of mercury.
0.283 pounds per cubic inch
The density of lead is 11.34g per cubic centimetre. As there are 16.387 cubic centimetres in one cubic inch, one cubic inch of lead weighs 11.34 X 16.387 or 185.83grams. In ounces this is 6.55 (or just over 6 and a half) ounces.
Let's assume that the density of marble is 2.76 gm/cm3. Marble varies somewhat in density depending upon the type of marble; so your marble may vary from this number. 0.75 inch X 1 square foot X 144 square inches/square foot = 108 cubic inches 2.76 gm/cm3 X 16.39 cm3/cubic inch X 108 cubic inches = 4886 gms 0.00220 pounds/gm X 4886 gms = 10.7 pounds