sedimentary

Mookaite Jasper

Radiolarite (Silica with iron oxides like Goethite and Hematite)

Hardness: 6.5-7 (Mohs); Color: Deep reds, purples, mustards, and browns; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7.

Hardness: 6
Color: Deep reds, purples, mustards, and browns
Luster: Vitreous to dull

Identified June 2, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the fossilized remains of radiolaria (microscopic organisms) that settled in seabed sediments. These remains were slowly replaced by silica-rich groundwater. Specifically found in the Windalia Radiolarite formation of Western Australia.

Uses & applications

Primarily used as a lapidary material for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal collecting and metaphysical purposes.

Geological facts

Mookaite is named after Mooka Creek in the Kennedy Ranges of Western Australia, which is the only place in the world where this specific type of radiolarite jasper is found.

Field identification & locations

Identify in the field by its distinct vibrant earthy palette (resembling paint spills) and its high gloss when polished. Look for a dense, opaque texture that cannot be scratched by a steel blade. It is locally concentrated in creek beds near the Kennedy Range.

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