sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91

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

Identified June 19, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed through the deposition of silica-rich fluids in volcanic or sedimentary environments, often associated with hydrothermal activity. The yellow color comes from the inclusion of goethite or iron hydroxides.

Uses & applications

Used primarily in lapidary work for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock tumbling and metaphysical collections.

Geological facts

Jasper is an opaque variety of chalcedony. It has been used since ancient times for seals and talismans, and yellow jasper specifically is often associated with protection and solar energy in folklore.

Field identification & locations

Identify by its opaque nature (unlike agate), smooth waxy texture when wet/polished, and high hardness. Commonly found in riverbeds and coastal areas worldwide, particularly in India, Russia, and the USA.