sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Hexagonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.7

Hardness: 6
Color: Yellow to brownish-yellow
Luster: Vitreous to waxy

Identified March 17, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Over millions of years, the silica crystallizes into microcrystalline quartz (chalcedony), with the yellow hue derived from iron mineral impurities like goethite.

Uses & applications

Used primarily in lapidary work for cabochons, beads, and tumbled stones. It is popular in jewelry and as a decorative architectural stone. Historically used for making tools and seals.

Geological facts

Yellow jasper was historically worn by shaman as a protective stone during spiritual work. In ancient times, it was often referred to as a sun stone due to its vibrant gold-yellow tones.

Field identification & locations

Identify in the field by its opaque nature (unlike translucent chalcedony), smooth waxy feel when weathered, and conchoidal fracture. Commonly found in riverbeds, desert pavements, and volcanic regions globally, including Wyoming, Arizona, and Madagascar.

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