sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Specific Gravity: 2.58–2.91

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

Identified June 18, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal Structure: Trigonal (Microcrystalline); Specific Gravity: 2.58–2.91

Formation & geological history

Formed through the infiltration of silica-rich waters into sedimentary or volcanic rocks. The distinctive yellow color comes from iron-based mineral inclusions such as goethite or limonite.

Uses & applications

Commonly used for lapidary work, jewelry (cabochons), talismans, and ornamental carvings.

Geological facts

Jasper is an opaque variety of chalcedony. In ancient times, yellow jasper was often associated with solar energy and was thought to provide protection to travelers.

Field identification & locations

Identify in the field by its opacity, conchoidal fracture, and inability to be scratched by a steel knife. It is frequently found as water-worn pebbles in riverbeds or beaches.