sedimentary

Fancy Jasper (Mookaite style)

Silicon Dioxide (SiO2) with iron oxide impurities

Hardness: 6.5–7 (Mohs scale); Color: Variegated red, yellow, ochre, and tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.6–2.9

Hardness: 6
Color: Variegated red, yellow, ochre, and tan
Luster: Vitreous to waxy

Identified March 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich fluids in sedimentary basins or within volcanic cavities. The colors are derived from varying concentrations of hematite (red) and goethite (yellow/brown) during the maturation of the silica gel into chalcedony.

Uses & applications

Primarily used for lapidary work, cabochons, tumbled stones, jewelry beads, and ornamental carvings. It is also popular in holistic practices and as a desktop decorative piece.

Geological facts

Jasper is an opaque variety of chalcedony. While this specimen shares the color palette of Mookaite (a specific radiolarian chert from Australia), 'Fancy Jasper' is a broader trade name for multi-colored varieties of jasper found globally.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate) and its smooth, waxy feel when polished. It cannot be scratched by a steel knife. Common locations include India, Brazil, and Australia.

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