John Benett, the miner of mookaite at this time writes on his site about this gemstone-material:

... Mookaite is the common, or popular, name for the rock with the geological name Windalia Radiolarite, being a fine grained, silicified and multi-coloured, radiolarian siltstone, found in outcrops, principally on Mooka Station (a sheep farm of around 700,000 acres)on the west side of Kennedy Range in Western Australia. The Kennedy Range itself is located approximately 90 miles east of Carnarvon and 25 miles to the north west of Gascoyne Junction, a small town of around 60 people, and located at the first (heading west from Carnarvon) sealed crossing of the mighty (usually dry) Gascoyne River...

more informations about this material on John Benetts website www.mookaite.com