sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite or Limonite)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-yellow with darker mottling, Luster: Waxy to vitreous when wet or polished, Structure: Microcrystalline/Cryptocrystalline, Fracture: Conchoidal

Hardness: 6

Identified June 19, 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 within volcanic ash or sedimentary beds. The yellow coloration is caused by the inclusion of iron oxides during the silicification process.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and tumbled stones. Also used as a decorative stone in landscaping and aquariums.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was known as a stone of endurance and protection. The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone.

Field identification & locations

Identify in the field by its opacity (even on thin edges) and smooth, shell-like fracture pattern. Often found in riverbeds or coastal gravels where water action has smoothed the exterior.