(C) Cryolite $(Na_3AlF_6)$ is an ore of fluorine and aluminium. Bauxite $(Al_2O_3 \cdot 2H_2O)$ is the primary ore of aluminium. Haematite $(Fe_2O_3)$

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(C) Cryolite $(Na_3AlF_6)$ is an ore of fluorine and aluminium. Bauxite $(Al_2O_3 \cdot 2H_2O)$ is the primary ore of aluminium. Haematite $(Fe_2O_3)$ is the most important ore used for the industrial manufacture of iron. Chalcopyrite $(CuFeS_2)$ is an ore of copper.