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Option 2 : Greenockite
- Greenockite is an ore of Cadmium with chemical formula CdS. (Trick- Green Card > Green- Greenockite, Card- Cadmium).
- Cassiterite (SnO2) is an ore of tin (Sn).
- Cinnabar(HgS) is an ore of Mercury(Hg) and
- Calamine (Fe2O4Zn) is an ore of Zinc(Zn).
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