what are some economically important non-metallic mineral resources?

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Minerals are classified in many ways. One of the most popular way is based on their luster. Minerals with metallic luster are classified as metallic minerals and minerals with non-metallic luster are classified as non-metallic minerals. By and large most metallic minerals as ore are used for extraction of metal(s) but all metallic minerals are not used as ore of metals, e.g. pyrite is a metallic mineral but not used as an ore of iron. Similarly Bauxite (group of minerals) is non-metallic mineral(s) is used for extraction of aluminum and so on. thnks

There are many non-metallic mineral deposits which are economic. a) Industrial Minerals - Limestone, Dolomite, Glass Sand, Clay, Quartz, Gypsum, Barytes, Muscovite etc b) Fertilizer Minerals - Apatite, Phosphorite, Potash etc. c) Gemstones d) Rock Salt There are many other mineral which are mined because there is a demand for them, like, Calcite, Feldspar, Fluorite, Graphite, Kyanite Sillimanite (as refractory), Talc (Talcum Powder), Sulphur, etc. Besides chemical industry requires a number of non-metallic minerals as their raw materials. The list is