sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-gold; Luster: Vitreous to dull (waxy when polished); Structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Mustard yellow to brownish-gold
Luster: Vitreous to dull (waxy when polished)

Identified March 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or hydrothermal fluids into cracks or volcanic ash beds. The yellow color is caused by the presence of Goethite or other iron hydroxide inclusions. It is found in various geological layers from the Precambrian to recent eras.

Uses & applications

Commonly used in the lapidary arts for cabochons, beads, and decorative carvings. It is also a popular stone for tumbling, holistic healing practices, and as a durable material for jewelry due to its hardness.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, yellow jasper was known as a 'traveler's stone' of protection. It is often found as smooth river-worn stones because its high quartz content makes it resistant to physical weathering.

Field identification & locations

Identify in the field by its opacity (it does not transmit light even on thin edges, unlike agate), its smooth waxy texture, and its inability to be scratched by a steel knife. Common locations include India, South Africa, Madagascar, and the western United States.