sedimentary
Polished Mookaite Jasper
SiO2 (Silicon Dioxide with impurities)
Hardness: 6.5 to 7 on the Mohs scale. Colors: Mix of red, yellow, purple, brown, and cream. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline quartz/chalcedony). Cleavage: None, conchoidal fracture. Specific gravity: 2.58 - 2.91
- Hardness
- 6
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale. Colors: Mix of red, yellow, purple, brown, and cream. Luster: Vitreous to dull. Crystal structure: Trigonal (microcrystalline quartz/chalcedony). Cleavage: None, conchoidal fracture. Specific gravity: 2.58 - 2.91
Formation & geological history
Formed as a marine deposit from the skeletal remains of radiolaria and other microscopic organisms, consolidated into radiolarite and subsequently weathered in Western Australia. Geological age: Cretaceous period (approx. 120-140 million years old).
Uses & applications
Used primarily for lapidary work, cabochons, jewelry, carvings, and as decorative collector specimens.
Geological facts
Mookaite is found exclusively in the Kennedy Ranges of Gascoyne, Western Australia, near Mooka Creek, from which it gets its name.
Field identification & locations
Can be identified by its vibrant, multicolored earthy patterns combining distinct reds, yellows, and purples. It is typically found in alluvial deposits or weathered clay layers in Western Australia.
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