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The process utilized to extract a certain metal from its ore is determined by the metal's reactivity and thus the ore's stability. ... Ores of Calcium (Ca) (i) Limestone (ii) Dolomite (iii) Gypsum (iv) Anhydrite. CaCO 3 CaMg(CO 3) 2. CaSO 4.2H 2 O. CaSO 4. 14. Ores of Phosphorous (P) (i) Phosphorite (ii) Fluorapatite.