sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow to brownish-yellow
Luster: Vitreous to waxy

Identified June 18, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Yellow coloration is caused by the presence of iron oxide minerals like goethite.

Uses & applications

Used primarily for lapidary work, jewelry making (cabochons), pocket stones for meditation, and as an ornamental gemstone.

Geological facts

Jasper is an opaque variety of chalcedony. In ancient times, yellow jasper was often seen as a stone of protection and discernment, associated with the sun and the solar plexus chakra.

Field identification & locations

Identify in the field by its smooth, river-worn texture, high hardness (cannot be scratched by steel), and opaque nature. Commonly found in riverbeds and gravel deposits worldwide, including Africa, Brazil, and the USA.