sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Hardness: 6.5-7 (Mohs); Color: Mustard yellow, ochre, or earthy gold with dark brown inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58-2.91

Hardness: 6
Luster: Vitreous to dull

Identified July 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from silica-rich fluids that percolate through volcanic or sedimentary deposits. The yellow coloration is caused by the presence of goethite or limonite (iron oxides) during the formation process.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons and beads), decorative ornaments, and widely collected as a metaphysical or healing stone.

Geological facts

Yellow jasper is a microcrystalline variety of quartz. It has been used since antiquity for talismans and was often cited in ancient texts as a stone used in the breastplates of high priests.

Field identification & locations

Identify by its opaque earthy yellow color and high hardness (it will scratch glass). It is commonly found in riverbeds or as nodules in deserts. Key locations include India, South Africa, and the USA.

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