sedimentary

Mookaite Jasper

Silicified Radiolarite (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Variegated levels of yellow, mustard, burgundy, red, and cream; Luster: Vitreous to dull; Structure: Microcrystalline (Cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.7

Hardness: 6
Luster: Vitreous to dull

Identified March 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the skeletal remains of radiolaria (tiny organisms) that settled on shallow sea floors during the Cretaceous period. Over millions of years, these deposits were silicified by silica-rich groundwater. It is primarily found in the Windalia Radiolarite formation.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, pendants), ornamental carvings, and lapidary art. It is highly valued as a 'healing stone' in metaphysical circles.

Geological facts

Mookaite is found only in the Kennedy Ranges of Western Australia near Mooka Creek. The word 'Mooka' is an Aboriginal term meaning 'running waters'. Each piece is unique due to the swirling concentrations of iron and manganese that create its distinct colors.

Field identification & locations

Identify by its characteristic earthy color palette and high polish. In the field, look for opaque, multicolored nodules with a waxy feel. It is localized to the Gascoyne region of Western Australia.