sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9
- Hardness
- 6
- Color
- Yellow to brownish-yellow
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9
Formation & geological history
Formed through the deposition of silica from hydrothermal solutions or volcanic ash in sedimentary environments, often associated with iron oxide impurities that create the yellow hue.
Uses & applications
Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, lapidary art, and as a collector's specimen.
Geological facts
Yellow Jasper has been used by various cultures for thousands of years in amulets and tools; it is a dense, opaque variety of chalcedony that owes its color to the presence of goethite or limonite.
Field identification & locations
Identify by its hardness (cannot be scratched by a knife), opaque transparency, and smooth, waxy feel. It is commonly found in riverbeds, desert regions, and areas with ancient volcanic activity like the American Southwest and India.
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