'metallic mineral' is actually not always a very useful term; pretty much every mineral out there has metal in it of some kind. It's often used as a group descriptor for either minerals which have a metallic lustre, or - more commonly - for minerals which are used as economic reserves for extracting a particular metal (e.g. bauxite might be considered a metallic mineral because it's the prime source of aluminium).Furthermore, limestone is a rock, not a mineral. Calcium carbonate is the mineral.

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