sedimentary

Mookaite Jasper

Silicon Dioxide (SiO2) - variety of Chert/Jasper

Hardness: 6.5-7 (Mohs scale); Color: Variegated shades of purple, cream, pink, yellow, and deep red; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.63-2.65.

Hardness: 6
Luster: Vitreous to waxy

Identified May 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the fossilized remains of radiolaria, tiny microorganisms with silica shells, which deposited on the seabed during the Cretaceous period (approximately 66-145 million years ago) and were later silicified.

Uses & applications

Primarily used in jewelry, lapidary arts, cabochons, and as a decorative collector's stone. It is also highly popular in metaphysical and crystal healing communities.

Geological facts

Mookaite is found only in one place in the world: the Mooka Creek area in the Kennedy Ranges of Western Australia. The name 'Mooka' is an Aboriginal word meaning 'running waters'.

Field identification & locations

Identify by its distinctive earthy color palette and porcelain-like finish when polished. In the field, look for brittle, multicolored sedimentary deposits near the Mooka Creek bed. It often exhibits 'landscape' patterns.

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Sandstone or Siltstone

Arenite (if sandstone)

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Cone-in-cone structure (Limestone)

Cone-in-cone structure (Secondary Sedimentary Structure)

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Chert Breccia

Brecciated Chert (Microcrystalline Silica)

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Sandstone Grain

Clastic Sedimentary Rock Grain (SiO2 dominated)

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Shale or Slaty Mudstone

Argillaceous sedimentary rock

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Sandstone

Arenite (primarily SiO2)

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