Answer
Fool's gold.
Work Step by Step
Volume of the sample: $52.2-47.5=4.7\ mL=4.7\ cm^3$
Mass of the sample: 23.5 g
Density of the sample: $\rho=m/V=5.0\ g/cm^3$
Since its density is closer to fool's gold ($\rho=5.00\ g/cm^3$), the sample is fool's gold.
