sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Yellow to mustard-gold with brown/red swirls; Luster: Vitreous to waxy; Crystal structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Yellow to mustard-gold with brown/red swirls
Luster: Vitreous to waxy

Identified June 3, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Yellow to mustard-gold with brown/red swirls; 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 ash or sedimentary beds. The yellow color is typically provided by Goethite or other iron oxides. These stones date back hundreds of millions of years found in various geological strata.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular semi-precious stone for lapidary collectors.

Geological facts

Yellow Jasper was historically used by ancient civilizations as a protective talisman during spiritual journeys. It is a variety of Chalcedony widely known for its opaque nature and resistance to scratching.

Field identification & locations

Identify by its opacity (unlike Citrine) and smooth, conchoidal fracture. Common locations include South Africa, Brazil, Australia, and the United States. Look for intense yellow patterns often mixed with earth tones.