Consider the following minerals:1.Bentonite2.Chromite3.Kyanite4.Sillimanite In India,which of the above is/are officially designated as major minerals?

1. A

   1 and 2 only

   1 and 2 only. Bentonite is a minor mineral; kyanite and sillimanite are major.

2. B

   4 only

   4 only. Under-counts chromite and kyanite.

3. C

   1 and 3 only

   1 and 3 only. Bentonite is minor.

4. D

   2, 3 and 4 only

   2, 3 and 4 only. Chromite, kyanite, sillimanite — major minerals. Bentonite is notified as minor.

Summary. Official key is (d) 2, 3 and 4 only. Chromite, kyanite and sillimanite are major minerals. Bentonite is a minor mineral under the MMDR framework.