sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: mustard yellow to brownish-yellow; Luster: dull to waxy; Crystal Structure: microcrystalline trigonal (chalcedony/quartz); Cleavage: none, conchoidal fracture; Specific Gravity: 2.58-2.91

Hardness: 6
Color: mustard yellow to brownish-yellow
Luster: dull to waxy

Identified July 27, 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

Formation & geological history

Formed when microcrystalline quartz precipitates from silica-rich fluids in sedimentary or low-grade metamorphic environments, gaining its yellow pigmentation from fine inclusions of goethite or iron oxide.

Uses & applications

Used for lapidary work, decorative cabochons, tumbled stones, jewelry, and metaphysical collections.

Geological facts

Yellow Jasper has been used since antiquity in ancient seal rings and ornamental carvings. Its yellow hue is caused by goethite and limonite inclusions within the cryptocrystalline quartz matrix.

Field identification & locations

Identified by its smooth water-worn texture, opaque yellow color, and inability to be scratched by a steel pocketknife (hardness ~7). Commonly found in stream beds, gravel deposits, and coastal beaches globally.