Question

The mica export from India has declined in recent yes because

Answer 1

because Mica has become exhausted.

I hope this will help you

Answer 2

With the increased application and use of plastics and ceramics, the demand for mica has been drastically reduced, and it is used only in some particular strategic types of equipment.

The breaking down of the Soviet Union and the compelling trade relations with other countries has dropped the exports of mica from India to other countries.

One also needs to add the competition.

But the primary cause is the availability of alternatives to mica.