Mookaite Jasper

Physical Properties

Hardness: 6.5-7 (Mohs scale); Color: cream, mustard yellow, brick red, and maroon; Luster: Vitreous to dull; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9

Formation & Geological History

Formed as a result of the fossilization of Radiolaria (microscopic marine organisms) in a shallow sea during the Cretaceous period approximately 66-145 million years ago. Found primarily as a silicified porcelanite.

Uses & Applications

Predominantly used for jewelry, cabochons, carvings, and as a popular stone for lapidary collectors due to its vibrant colors and high polish ability.

Geological Facts

Mookaite is found only in the Kennedy Ranges of Western Australia near Mooka Creek. The name 'Mooka' is an Aboriginal word meaning 'running waters'. It is technically a silicified radiolarite.

Field Identification & Locations

Identify by its unique earthy color combinations (yellows and reds) and very fine texture. It is non-porous and feels cool to the touch. Look for the distinct brecciated or banded patterns typical of Australian jasper.

Identified on: 4/24/2026

Mode: Standard