In India, which of the above is/are officially designated as major minerals? (a) 1 and 2 only (b) 4 only (c) 1 and 3 only (d) 2, 3 and 4 only
Answer: D
Bentonite is essentially a highly plastic clay containing not less than 85% clay mineral, montmorillonite. It gets its name from Fort Benton, America, the place where its presence and usages were first discovered. The Government of India declared Bentonite as ‘Minor Mineral’. Chromite (Cr) is the single commercially viable ore of chromium which is chemically known as iron chromium oxide (Fe Cr2O4). Kyanite, Sillimanite and andalusite are anhydrous aluminosilicate minerals that have the same chemical formula Al2O3 but differ in crystal structure and physical properties. Chromite, Kyanite, and Sillimanite are major minerals.
