sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with high iron inclusion

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to pale golden, Luster: Vitreous to dull/waxy, Crystal structure: Trigonal (microcrystalline quartz), Specific gravity: 2.58-2.91

Hardness: 6

Identified March 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

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to pale golden, Luster: Vitreous to dull/waxy, Crystal structure: Trigonal (microcrystalline quartz), Specific gravity: 2.58-2.91

Formation & geological history

Formed through the accumulation of fine volcanic ash or silica-rich sediment that crystallizes over millions of years. This specimen shows water-worn rounding, likely from a fluvial or beach environment.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and tumbling. Also used historically for ornamentation and as an ornamental architectural stone.

Geological facts

Jasper is an opaque variety of chalcedony. The yellow hue is primarily due to the presence of goethite or other iron hydroxide minerals embedded within the silica matrix.

Field identification & locations

Identify in the field by its opacity (unlike translucent quartz), waxy texture when wet, and inability to be scratched by a steel knife. Frequently found in gravel beds or beaches near volcanic regions.