sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or limonite inclusions

AI-generated identification · may be incorrect

Hardness: 6.5–7 on Mohs scale; Color: Mustard yellow, ochre, gold; Luster: Dull or waxy when unpolished; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.91

Hardness: 6
Color: Mustard yellow, ochre, gold
Luster: Dull or waxy when unpolished

Identified April 9, 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 through the deposition of silica-rich fluids in volcanic ash or sedimentary layers. The yellow color comes from iron hydroxide minerals like goethite incorporated during formation.

Uses & applications

Used primarily in lapidary work, jewelry (cabochons), interior decoration, and as a pocket stone for collectors and spiritual practices.

Geological facts

Jasper is an opaque variety of chalcedony. It has been used since ancient times for seals, beads, and amulets. King John of England was famously buried with jasper items.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife) and its smooth, shell-like (conchoidal) fracture surface. Common in riverbeds and desert environments.