Mookaite is a variety of Silicified Siltstone from Western Australia. It owes its popularity to its lovely reds, purples, browns and yellows that swirl together in pleasing shapes within each unique piece. Depending on who you ask, it is sometimes described as a Chert, Chalcedony or Opalite. It is named after Mooka Station, originally a sheep farm in Australia's Kennedy Range.

Mookaite cuts like most Jaspers, being hard and taking a beautiful polish. It is not terribly expensive at gem shows, and is popular when set in jewelry. The top left photo is Mookaite shown wet.