sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Vitreous to waxy, Structure: Microcrystalline/Cryptocrystalline, No cleavage, SG: 2.58-2.91

Hardness: 6

Identified May 25, 2026More sedimentary →

Explore Yellow Jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Vitreous to waxy, Structure: Microcrystalline/Cryptocrystalline, No cleavage, SG: 2.58-2.91

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, with iron inclusions providing the yellow hue. Common in sedimentary deposits and volcanic environments.

Uses & applications

Used primarily in lapidary work, jewelry (cabochons, beads), decorative carvings, and as a popular stone for tumbling and meditation.

Geological facts

Jasper is known as the 'supreme nurturer' in folklore. Yellow Jasper specifically gets its color from the presence of goethite or limonite. It was highly prized in ancient civilizations for its protective qualities.

Field identification & locations

Identify by its opaque nature, smooth conchoidal fracture, and inability to be scratched by a steel knife. Frequently found in riverbeds, deserts, and coastal areas globally.