These rocks have a unique appearance due to orbicules - concentrically layered, spheroidal structures, probably formed through nucleation around a grain in a cooling magma chamber due to rapid physical changes.

[3] In the Namaqualand, South Africa, just west of the small town of Concordia, there is a rare occurrence of orbicular granite.

The outcrop, known as Orbicule Hill or "wonderkoppie" (as it is locally known), is a provincial heritage site and one of just two known occurrences in South Africa.

When cut and polished, the granite has a very attractive pinkish colour with lighter and darker shades of grey oval shaped or orbicular inclusions.

The geology of the surrounding area can be described as gneissic and granitic and is better known for its once rich copper deposits.