The Vindhyan system of rocks is important for the production of precious stones and building materials.

Explanation:

The system derives its name from the Vindhyan hills where its rocks are prominently exposed. It forms a dividing line between the Ganga Plain and the Deccan. The main rocks of the Vindhyan system are coarse, medium, and fine-textured sandstones, shales, and limestones. The Vindhyan system of rocks bear out precious stones, ornamental stones, diamonds, building materials, and raw materials for cement, lime, glass, and chemical industries