Metallurgy

\(\mathrm{K}_2 \mathrm{SO}_4 \cdot \mathrm{Cr}_2\left(\mathrm{SO}_4\right)_3 \cdot 24 \mathrm{H}_2 \mathrm{O}\) (chrome alum)

\(\mathrm{PbCrO}_4\) (chromite yellow)

\(\mathrm{FeCr}_2 \mathrm{O}_4\) (chromite)

\(\mathrm{PbCrO}_4 \cdot \mathrm{PbO}\) (chrome red)