In India, the classification of minerals into major and minor categories is based on their economic importance and industrial usage. Major minerals like chromite, kyanite, and sillimanite contribute significantly to industries such as metallurgy and ceramics, which are essential for infrastructure and development. In contrast, bentonite, while useful in various applications like drilling and as a binding agent, is classified under minor minerals due to its relatively lower economic status and production scale. This classification is crucial for understanding resource management and policy-making in the context of India's mineral sector, as outlined in standard UPSC preparation materials.