sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline/cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow to golden brown
Luster: Vitreous to waxy

Identified March 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or within volcanic ash beds. The yellow color is primarily due to the presence of goethite or iron hydroxides. It can form in various geological ages ranging from the Precambrian to recent alluvial deposits.

Uses & applications

Commonly used for lapidary work, cabochons, beads for jewelry, and as a decorative landscaping stone. In industry, it can be used for abrasion-resistant components due to its hardness.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, yellow jasper was known as a stone of protection and discernment. Each specimen is unique because the banding and color variations are determined by the local mineral impurities where it formed.

Field identification & locations

Identify in the field by its opaque nature (unlike translucent agate), conchoidal fracture, and inability to be scratched by a steel blade. Commonly found in riverbeds, gravel pits, and coastal areas throughout the Western United States, Egypt, and India.