sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) - Opaque variety of Chalcedony/Quartz

AI-generated identification · may be incorrect

Hardness: 6.5-7.0 (Mohs scale); Color: Mustard yellow, golden brown; Luster: Vitreous to dull; Crystal structure: Trigonal (Microcrystalline); Cleavage: None; Specific gravity: 2.6-2.9

Hardness: 6
Color: Mustard yellow, golden brown
Luster: Vitreous to dull

Identified March 30, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7.0 (Mohs scale); Color: Mustard yellow, golden brown; Luster: Vitreous to dull; Crystal structure: Trigonal (Microcrystalline); Cleavage: None; Specific gravity: 2.6-2.9

Formation & geological history

Formed from silica-rich fluids depositing in volcanic ash or sedimentary beds over millions of years. The yellow color is primarily due to the presence of goethite or iron oxide inclusions during the petrification process.

Uses & applications

Used widely in decorative arts, jewelry (cabochons and beads), spiritual/holistic practices, and as a durable material for mosaics and small carvings.

Geological facts

Jasper has been used since antiquity; it was known as the 'Supreme Nurturer' in ancient times. The yellow variety specifically was historically used by travelers as a stone of protection.

Field identification & locations

Identify in the field by its opaque nature (unlike translucent Citrine), smooth conchoidal fracture, and inability to be scratched by a steel knife. Found commonly in South Africa, Madagascar, Australia, and the USA.