Ilmenite and rutile, abundantly available in certain coastaltracts of India, are rich sources of which one of the followin

Ilmenite and rutile are primarily rich sources of titanium.

1. Ilmenite (FeTiO₃): Ilmenite is an iron titanium oxide mineral. It is the main ore of titanium and is extensively mined for its titanium content.

2. Rutile (TiO₂): Rutile is another important mineral that contains titanium. It is highly prized for its high titanium content and is often used in the production of titanium dioxide, which is a white pigment used in paints, plastics, and paper.

Both minerals play a crucial role in the titanium industry, providing the necessary elements for various applications, including metal production and as a pigment. Thus, the correct answer is that ilmenite and rutile are rich sources of titanium.