Probably a gram. More physics than maths, but ...
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1.5 gm = 1,500 mg
1963 US dimes, quarters, and half dollars were made of an alloy of 90% silver and 10% copper. The alloyed and pure silver weights of these coins were: Dime: 2.5 gm / 2.25 gm Quarter: 6.25 gm / 5.625 gm Half: 12.5 gm / 11.25 gm
Amorphous polypropylene has a density of 0.855 gm/cm3. To convert to gm/cubic inch, 0.855 gm/cm3x16.39 cm3/cubic inch = 14.0 gm/cubic inch
NOTHING ... gm sucks !
Morgan and Peace dollars - 26.7 gm Eisenhower dollars - 22.7 gm SBA, Sacagawea, and Presidential dollars - 8.1 gm