Sedimentary Rock

Mookaite Jasper

Siliceous sedimentary rock (variety of Jasper/Chert)

Hardness: 6.5-7 on Mohs scale. Color: Highly varied, often vibrant with shades of red, burgundy, yellow, mustard, cream, brown, pink, and sometimes purple. Often displays swirling or banded patterns. Luster: Vitreous to dull. Crystal Structure: Cryptocrystalline (microscopic quartz crystals), massive habit.…

Hardness: 6
Luster: Vitreous to dull

Identified November 27, 2025More sedimentary rock →

Identify your own rocks.

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

App Store Google Play

Physical properties

Formation & geological history

Mookaite Jasper is a silicified radiolarite, meaning it formed from the fossilized remains of microscopic organisms (radiolarians) that accumulate on the seabed. Over time, these sediments are replaced by silica (chert or chalcedony), often along with iron oxides which give it its characteristic colors. Its formation is associated with the weathering and deposition of silica-rich material mixed with clay along ancient shorelines or shallow marine environments. Geological Age: Predominantly found in the Early Cretaceous period rocks of Western Australia.

Uses & applications

Predominantly used as an ornamental stone in jewelry (beads, cabochons, carvings) due to its striking colors and patterns. Also used for decorative objects and as a healing/meditation stone in metaphysical practices.

Geological facts

Mookaite is a term given by local Aboriginal people to refer to the Mooka Creek area, where this jasper is exclusively found. It is known for its vivid colors, which are attributed to the presence of various impurities, primarily iron oxides, within the silica. The term 'Jasper' itself is often applied to opaque, fine-grained varieties of chalcedony.

Field identification & locations

To identify Mookaite in the field, look for its distinctive earthy and vibrant color combinations (reds, yellows, creams, purples) and often swirled or banded patterns. It has a relatively smooth feel when polished and is opaque. Its primary and almost exclusive source is the Kennedy Ranges of Western Australia, specifically around Mooka Creek. Collectors often look for pieces with strong color contrast and interesting patterns.

Other sedimentary rock specimens

See all

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

sedimentary

Devil's Toenail

Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)

sedimentary

Fossiliferous Sedimentary Rock (Coquina/Limestone)

Fossiliferous Calcarenite / Bioclastic Limestone

sedimentary

Moqui Marble (Shaman Stone)

Iron Oxide Concretion (Goethite/Hematite shell with Sandstone core)

sedimentary

Sedimentary rock with quartz veining

Laminated siltstone or mudstone with hydrothermal quartz veins

sedimentary

Quartz Vein in Sedimentary Rock

Silicon Dioxide (SiO2) with host Chert or Limestone

mineral