The correct answer is: A) Magnesite.
Magnesite is a magnesium carbonate mineral with the chemical formula MgCO3. It is a white, gray, or brown mineral that is found in metamorphic and sedimentary rocks. Magnesite is an important industrial mineral, and it is used in a variety of applications, including the production of magnesium metal, magnesium oxide, and magnesia cement.
Gypsum is a calcium sulfate mineral with the chemical formula CaSO4·2H2O. It is a white, colorless, or gray mineral that is found in sedimentary rocks. Gypsum is an important industrial mineral, and it is used in a variety of applications, including the production of plaster, drywall, and cement.
Graphite is a carbon mineral with the chemical formula C. It is a black or dark gray mineral that is found in metamorphic and igneous rocks. Graphite is an important industrial mineral, and it is used in a variety of applications, including the production of pencils, lubricants, and electrodes.
Mica is a group of sheet silicate minerals with the chemical formula KAl2(AlSi3O10)(OH,F)2. It is a transparent or translucent mineral that is found in igneous and metamorphic rocks. Mica is an important industrial mineral, and it is used in a variety of applications, including the production of electrical insulation, roofing materials, and cosmetics.
In the limestone deposits of Karnataka, magnesite is found associated with the limestone. Magnesite is a white, gray, or brown mineral that is found in metamorphic and sedimentary rocks. It is an important industrial mineral, and it is used in a variety of applications, including the production of magnesium metal, magnesium oxide, and magnesia cement.