sedimentary
Mookaite Jasper
Radiolarite (Silica-rich sedimentary rock featuring Hematite and Goethite)
Hardness: 6.5-7 (Mohs scale). Color: Earthy palette of mustard yellow, maroon, cream, and pink. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline. Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.7.
- Hardness
- 6
- Color
- Earthy palette of mustard yellow, maroon, cream, and pink
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale). Color: Earthy palette of mustard yellow, maroon, cream, and pink. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline. Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.7.
Formation & geological history
Formed from the fossilized remains of microscopic sea creatures called radiolaria, which accumulated as silica-rich silt on the seafloor. Over millions of years, chemical changes and iron inclusions created the distinct colors. Found primarily in the Windalia Radiolarite formation (Cretaceous period) in Western Australia.
Uses & applications
Widely used for lapidary work including cabochons, beads, and ornamental carvings. It is popular in the metaphysical community and for jewelry due to its vibrant colors and polish.
Geological facts
Named after Mooka Creek in Western Australia, which is the only place in the world where this specific variety is found. The word 'Mooka' is an Aboriginal word meaning 'running waters'.
Field identification & locations
Identified by its distinctive 'brecciated' or banded appearance of yellow and red silicates. It has a smooth, waxy feel when polished and breaks with sharp, shell-like edges (conchoidal fracture). Look for it in the Kennedy Ranges of Western Australia.
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