sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxyhydroxides / Goethite

AI-generated identification · may be incorrect

Hardness: 6.5 - 7 on the Mohs scale; Color: mustard yellow to ochre brown with reddish-brown to dark dendritic veins; Luster: vitreous to waxy (high polish shown); Crystal system: Trigonal (microcrystalline/cryptocrystalline quartz); Cleavage: None, conchoidal fracture; Specific gravity: ~2.6 - 2.8

Hardness: 6
Luster: vitreous to waxy (high polish shown)

Identified October 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed via diagenetic or hydrothermal precipitation of silica-rich fluids filling fissures or replacing original sediments, with yellow coloration provided by finely disseminated iron minerals (such as goethite or limonite).

Uses & applications

Popular as ornamental stones, lapidary carvings, cabochons, polished decorative display freeforms, and meditation/collector stones.

Geological facts

Jasper is an opaque variety of chalcedony. The word 'jasper' originates from the Greek 'iaspis', meaning 'spotted stone'. In ancient times, yellow jasper was often carried as a protective talisman.

Field identification & locations

Can be identified by its opaque mustard-yellow body, lack of translucency, conchoidal fracture, and Mohs hardness of 7. Often found in South Africa, Madagascar, Australia, and the western United States.