sedimentary

Mookaite Jasper

Silicified Radiolarite (SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Red, yellow, cream, pink, maroon, burgundy; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7

Hardness: 6
Color: Red, yellow, cream, pink, maroon, burgundy
Luster: Vitreous to dull

Identified June 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as a result of the skeletal remains of radiolaria (microscopic marine organisms) being deposited on shallow sea floors, which then underwent silicification during the Cretaceous period (approx. 145-66 million years ago).

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock collectors and metaphysical enthusiasts.

Geological facts

Mookaite is found only in the Kennedy Ranges near Gascoyne Junction in Western Australia. It is named after Mooka Creek, where much of it is unearthed. The word "Mooka" is an Aboriginal term meaning "running waters."

Field identification & locations

Identify by its unique earthy color palette (resembling desert tones) and high polish. It is mostly found in the dry creek beds of the Windalia Radiolarite formation in Western Australia.