sedimentary

Mookaite Jasper

Radiolarite (SiO2)

Hardness: 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

Identified July 13, 2026More sedimentary →

Explore Mookaite Jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

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.