sedimentary

Yellow Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None, Specific Gravity: 2.58-2.91

Hardness: 6

Identified June 13, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Microcrystalline, Cleavage: None, Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of fine volcanic ash or silica-rich sediments in marine environments that have been subjected to high pressure and mineral-rich fluid infiltration. It is a dense, opaque variety of chalcedony.

Uses & applications

Primarily used for lapidary arts, jewelry (cabochons), talismans, and as a collector's specimen due to its unique patterns and grounding properties.

Geological facts

Yellow Jasper is historically known as a stone of protection and endurance. It contains high amounts of iron oxide, which gives it its distinct yellow-brown hue.

Field identification & locations

Identify by its opacity, conchoidal fracture (curved glass-like breaks), and its inability to be scratched by a steel knife. Commonly found in riverbeds and arid landscapes in India, Australia, and the USA.