sedimentary
Mookaite Jasper
Radiolarite (SiO2)
AI-generated identification · may be incorrectHardness: 6-7 Mohs; Color: reddish-brown, yellow, mustard, cream; Luster: vitreous to waxy; Texture: fine-grained/cryptocrystalline; Fractures: conchoidal.
- Hardness
- 6-7 Mohs
- Color
- reddish-brown, yellow, mustard, cream
- Luster
- vitreous to waxy
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Physical properties
Hardness: 6-7 Mohs; Color: reddish-brown, yellow, mustard, cream; Luster: vitreous to waxy; Texture: fine-grained/cryptocrystalline; Fractures: conchoidal.
Formation & geological history
Formed from the skeletal remains of radiolaria (microscopic organisms) deposited in shallow seafloors, subsequently silicified. Found primarily in the Windalia Radiolarite formation of Western Australia, dating to the Lower Cretaceous age.
Uses & applications
Mainly used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock collectors and lapidary enthusiasts.
Geological facts
The name 'Mookaite' comes from Mooka Creek in the Kennedy Ranges of Western Australia; 'Mooka' is an Aboriginal word meaning 'running waters'. It is technically a silicified radiolarite rather than a true jasper.
Field identification & locations
Identify by its unique earthy color palette of 'mustard-yellow' and 'burgundy' often in swirling patterns. It is almost exclusively mined in the Carnarvon Basin in Western Australia.
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