sedimentary

Mookaite Jasper

Silicified Radiolarite (SiO2 with impurities)

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Yellow, mustard, ochre, maroon, and purple; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.63-2.65

Hardness: 6
Color: Yellow, mustard, ochre, maroon, and purple
Luster: Vitreous to dull

Identified March 28, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Yellow, mustard, ochre, maroon, and purple; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific gravity: 2.63-2.65

Formation & geological history

Formed through the silicification of skeletal remains of tiny marine organisms called radiolarians. These settled on the ocean floor and were later replaced by silica-rich groundwater. They are primarily from the Cretaceous period (about 66-145 million years ago).

Uses & applications

Commonly used in jewelry (cabochons and beads), decorative ornaments, and spiritual collecting. Its hardness makes it suitable for lapidary work and tumbled stones.

Geological facts

Mookaite is found exclusively in Western Australia at the Kennedy Range. It is named after Mooka Creek, where 'Mooka' is an Aboriginal word meaning 'running waters'.

Field identification & locations

Identify by its unique earthy color combinations and waxy/glossy finish when polished. In the field, look for porcelain-like fractured fragments in dry creek beds near the Kennedy Ranges of Australia.