laterite

A red residual soil formed by the leaching of silica and by the enrichment with aluminum and iron oxides, especially in humid climates.

A rock of peculiar character, found in India and some parts of southwestern Asia.

An argillaceous sandstone, of a red color, and much seamed; — found in India.

A red hard or gravel-like soil or subsoil formed in the tropics that has been leached of soluble minerals leaving insoluble iron and aluminium oxides and hydroxides; used to make bricks and roads.

a red soil produced by rock decay; contains insoluble deposits of ferric and aluminum oxides