Which clay mineral is rich in potash

Solution (By Examveda Team)

Lllite is a group of closely related non-expanding clay minerals. It is a secondary mineral precipitate and an example of phyllosilicate, or layered alumino-silicate. Its structure is a 2 : 1 sandwich of silica tetrahedron (T) - alumina octahedron (O) - silica tetrahedron (T) layer.
Illite is a clay mineral is rich in potash.