Mookaite
Mookaite Jasper (Silicified radiolarite) · Semi-Precious Gemstone / Decorative Stone
Crystal System
Trigonal/Microcrystalline; habit is typically massive or earthy, occurring as sedimentary layers or nodules.
Mineral Group
Silicates (Tectosilicate), specifically a variety of Chalcedony/Jasper.
Chemical Formula
SiO2 with various impurities such as Fe2O3 (Hematite) and FeO(OH) (Goethite)
Formation Process
Sedimentary and Biogenic; it forms from the silicified remains of radiolaria (microscopic marine organisms) deposited in shallow sea beds, later undergoing hydrothermal or groundwater silica replacement.
About This Crystal
An opaque, microcrystalline stone with a smooth, vitreous to waxy luster when polished. It features a distinctive color palette of earthy tones including mustard yellow, brick red, burgundy, cream, and mauve in swirling or banded patterns.
Physical Characteristics
Color: Red, yellow, cream, purple, brown. Streak: White. Cleavage: None. Fracture: Conchoidal to splintery. Specific Gravity: 2.63 - 2.65. Tenacity: Brittle. Fluorescence: None.
Optical Properties
Refractive Index: 1.544 - 1.553. Birefringence: None (aggregate). Pleochroism: None. Optical Effect: Opaque with no specific phenomena.
Hardness & Durability
Origin Region
Mooka Creek area in the Kennedy Ranges near Gascoyne Junction, Western Australia.
Hardness & Durability
Mohs hardness of 6.5 to 7. Excellent durability and toughness for jewelry, comparable to other jaspers and quartz-based stones.
Care & Maintenance
Clean with warm soapy water and a soft brush. Avoid harsh chemicals and prolonged exposure to high heat. Generally stable and safe for ultrasonic cleaners if no fractures are present.
Rarity & Value
Common to Uncommon; though geographically limited to one main area in Australia, it is widely available. Value is based on color vibrancy and pattern complexity.
Special Characteristics
Known for its unique 'porcellanite' texture, a specific type of silicified siltstone/claystone that takes a high ceramic-like polish.
Lore & History
Traditionally used by Indigenous Australians as a 'stone of strength.' In modern lore, it is associated with the Root, Solar Plexus, and Third Eye chakras, believed to aid in decision-making and connecting with Earth's energies.