sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
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
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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.
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