sedimentary

Mookaite Jasper

Silicified Radiolarite (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5–7 on the Mohs scale. Color: Earthy tones including red, yellow, mustard, purple, and cream. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline. Cleavage: None (conchoidal fracture). Specific gravity: 2.63–2.65.

Hardness: 6
Luster: Vitreous to dull

Identified March 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the fossilized remains of radiolaria (microscopic marine organisms) that settled in shallow sea beds during the Cretaceous period (approx. 145–66 million years ago), which then underwent silicification.

Uses & applications

Primarily used in jewelry making (cabochons and beads), rock tumbling, lapidary arts, and as decorative ornamental stone.

Geological facts

Mookaite is found exclusively in Western Australia at Mooka Station near the Kennedy Ranges. The name 'Mooka' comes from an Aboriginal word meaning 'running waters.' It is technically a biogenic sedimentary rock that has been replaced by silica.

Field identification & locations

Identify by its unique earthy color palette and high polish. In the field, look for opaque, multicolored nodules in the Windalia Radiolarite formation. Collectors value pieces with distinct banding or rare purple hues.