1 troy ounce = 31.1 g
Total mass = 25 coins * 31.1 g/coin + 6.5 g = 784.0 g

1 inch = 2.54 cm
Volume = L * pi * r^2 = 10.6 cm * 3.14 * (0.8 in * 2.54 cm/in)^2 = 33.28 cm * (2.03 cm)^2 = 137.4 cm^3

Density = mass/volume = (784.0 g) / (137.4 cm^3) = 5.71 g/cm^3
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