Mookaite jasper (also known as mookite) is named after Mooka Creek which is located in the Kennedy Range near Gascoyne Junction, about 100 miles inland from the coastal town of Carnarvon in Western Australia. Mookaite is a variety of chalcedony and is very popular because of its gorgeous purple color. But you can also find mookaite jasper in cream, brown, grey, yellow, white, mauve, purple red, and orange red color.
Jasper, an aggregate of microgranular quartz and/or chalcedony and other mineral phases, is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rarely blue. The common red color is due to iron(III) inclusions.
Jasper is an opaque rock of virtually any color stemming from the mineral content of the original sediments or ash. Patterns arise during the consolidation process forming flow and depositional patterns in the original silica rich sediment or volcanic ash. Hydrothermal circulation is generally thought to be required in the formation of jasper.
Jasper can be modified by the diffusion of minerals along discontinuities providing the appearance of vegetative growth, i.e., dendritic. The original materials are often fractured and/or distorted, after deposition, into diverse patterns, which are later filled in with other colorful minerals. Weathering, with time, will create intensely colored superficial rinds.