sedimentary

Mookaite Jasper

Silicified Radiolarite (SiO2)

Hardness: 6.5-7 on Mohs scale. Color: Highly variable with bands of yellow, red, maroon, and cream. Luster: Vitreous to greasy. Crystal Structure: Hexagonal (Microcrystalline). Cleavage: None. Specific Gravity: 2.6-2.7.

Hardness: 6
Color: Highly variable with bands of yellow, red, maroon, and cream
Luster: Vitreous to greasy

Identified June 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as a silicified sedimentary rock from the skeletal remains of radiolaria (microscopic marine organisms) deposited in shallow sea beds during the Cretaceous period (approx. 66-145 million years ago).

Uses & applications

Primarily used in jewelry making for cabochons and beads, as well as for decorative carvings, lapidary art, and as a popular collector's gemstone.

Geological facts

Mookaite is found exclusively in Western Australia near Mooka Station. Its name comes from the Aboriginal word 'Mooka', meaning 'running waters'. It is celebrated for its unique earthy color palette that mimics the Australian Outback.

Field identification & locations

Identify by its characteristic earthy warm tones and conchoidal fracture. Collectors should look for vibrant, multi-colored banding and a high-polish finish. It is easily found in the Windalia Radiolarite formation.