sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Yellow, mustard, or gold with brownish swirls; Luster: Dull to vitreous; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.6-2.9.

Hardness: 6
Color: Yellow, mustard, or gold with brownish swirls
Luster: Dull to vitreous

Identified June 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica from water solutions or volcanic ash, occurring in sedimentary beds or volcanic rocks. The yellow color is primarily due to the presence of goethite or other iron oxides.

Uses & applications

Used primarily in lapidary work for jewelry, cabochons, beads, and as decorative tumbled stones for collectors.

Geological facts

Jasper is an opaque variety of chalcedony. It has been used by ancient civilizations for amulets and tools for thousands of years due to its durability and ability to hold a sharp edge.

Field identification & locations

Identified by its opacity, smooth conchoidal fracture, and hardness (cannot be scratched by a steel knife). Commonly found in riverbeds or desert regions globally, particularly in India, Russia, and the USA.