The correct answer is: Limestone.
Gujarat is a leading producer of limestone in India. Limestone is a sedimentary rock composed mainly of calcium carbonate (CaCO3). It is the most abundant sedimentary rock in the world and is found in all continents. Limestone is used in a variety of industries, including construction, cement, and iron and steel.
Bauxite is an aluminium ore that is found in tropical and subtropical regions. It is the main source of aluminium metal. Bauxite is a soft, earthy rock that is usually red, brown, or yellow in color. It is composed of hydrated aluminum oxide and hydroxide minerals.
Gypsum is a mineral that is used in a variety of industries, including construction, agriculture, and medicine. It is the main source of gypsum plaster, which is used in drywall and other construction materials. Gypsum is also used in fertilizer, papermaking, and other industries.
Lignite is a type of coal that is found in sedimentary rocks. It is the lowest rank of coal and is also known as brown coal. Lignite is soft and has a high moisture content. It is used in power plants and other industries.
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