Kimberlite Location: Dutoitspan, Kimberley, South Africa.
Kimberlite is a rare alkaline igneous rock, found in a restricted number of locations. It is well studied, as it is a main source of diamonds. Diamonds form at high pressures and temperatures and are carried to the surface by by rocks which have deep within the Earth's mantle. Studies of Kimberlite offer important clues to the Earth's deep processes.