sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs), Color: mustard yellow to honey gold, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.6-2.9

Hardness: 6

Identified July 7, 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), Color: mustard yellow to honey gold, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.6-2.9

Formation & geological history

Formed through the accumulation of silica from either volcanic ash or hydro-thermal solutions that fill cracks and cavities in rocks. The yellow coloration comes from high iron content, specifically limonite or goethite, during the silica precipitation process.

Uses & applications

Used primarily in lapidary arts for making cabochons, beads, and decorative carvings. It is also popular in metaphysical circles and as a collector's tumbled stone.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, yellow jasper was considered a stone of protection for travelers.

Field identification & locations

Identify by its complete opacity (unlike citrine which is translucent) and its smooth, waxy surface when polished. Commonly found in South Africa, Brazil, and the USA. It will easily scratch glass but cannot be scratched by a steel knife.