sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Yellow/ochre with brownish banding; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline (trigonal); Cleavage: None; Specific Gravity: 2.6-2.7

Hardness: 6
Color: Yellow/ochre with brownish banding
Luster: Vitreous to waxy

Identified June 30, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Yellow/ochre with brownish banding; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline (trigonal); Cleavage: None; Specific Gravity: 2.6-2.7

Formation & geological history

Formed via the accumulation of silica-rich fluids in volcanic ash or sedimentary deposits, often during the Precambrian to Paleozoic eras. The yellow color is derived from goethite or other iron hydroxide inclusions.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons), ornamental carvings, and by collectors for its aesthetic patterns. Historically used for making tools due to its conchoidal fracture.

Geological facts

Yellow Jasper was historically known as a stone of protection and discernment. It is a variety of chalcedony that is opaque due to high mineral impurities.

Field identification & locations

Identify by its opacity, smooth waxy texture when polished, and characteristic banding. Often found in riverbeds or desert regions globally, notably in South Africa, India, and the USA. Collectors look for unique parallel banding.