sedimentary

Mookaite Jasper

Radiolarite (Silica, SiO2)

Hardness: 6-7 on Mohs scale; Color: Earthy tones including red, burgundy, yellow, cream, and brown; Luster: Vitreous to greasy; Crystal Structure: Cryptocrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9.

Hardness: 6-7 on Mohs scale
Luster: Vitreous to greasy

Identified March 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the fossilized remains of microscopic protozoa called Radiolaria. Over millions of years (specifically during the Lower Cretaceous period), these skeletal remains settled into sea beds and were silicified into chert/jasper through chemical groundwater processes.

Uses & applications

Predominantly used as a gemstone for jewelry (pendants, beads, cabochons) and ornamental carvings. It is popular in the metaphysical community and collected for its unique 'watercolor' patterns.

Geological facts

Mookaite is found specifically in the Mooka Creek area of Western Australia. The term 'Mooka' comes from an Aboriginal word meaning 'running waters'. It is technically a silicified porcellanite which can contain opalite and chert as well.

Field identification & locations

Identify by its distinctive earthy, opaque color palette and smooth, waxy surface when polished. Found near fossiliferous outcrop areas in Western Australia. Collectors look for vibrant 'ribbon' patterns or unusual color combinations.