(D) The chemical formulas for the given minerals are:$1$. Copper pyrite: $CuFeS_2$ (contains iron)$2$. Iron pyrite: $FeS_2$ (contains iron)$3$. Ilmeni

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(D) The chemical formulas for the given minerals are:$1$. Copper pyrite: $CuFeS_2$ (contains iron)$2$. Iron pyrite: $FeS_2$ (contains iron)$3$. Ilmenite: $FeTiO_3$ (contains iron)$4$. Tincal: $Na_2B_4O_7 \cdot 10H_2O$ (does not contain iron)Therefore,Tincal is the correct answer.