sedimentary

Mookaite Jasper

Radiolarite (SiO2)

Hardness: 6.5-7 Mohs; Color: Brown, red, yellow, cream, and purple; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.6-2.9

Hardness: 6
Color: Brown, red, yellow, cream, and purple
Luster: Vitreous to dull

Identified July 17, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Brown, red, yellow, cream, and purple; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.6-2.9

Formation & geological history

Formed from the skeletal remains of radiolaria (tiny sea creatures) that settled in shallow sea beds and were later fossilized by silica-rich groundwater. Found specifically in the Windalia Radiolarite formation near Mooka Creek in Western Australia.

Uses & applications

Used primarily in lapidary work for cabochons, beads, decorative carvings, and as a popular specimen for collectors due to its vibrant colors.

Geological facts

The name Mookaite is a localized name from Mooka Creek; 'Mooka' is an Aboriginal word meaning 'running waters'. It is technically a fossilized porcellanite.

Field identification & locations

Identify by its unique earthy color transitions and conchoidal fracture. Found exclusively in the Carnarvon Basin of Western Australia. Collectors look for high-contrast patterns and rare purple hues.