sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine silica-rich sediment or volcanic ash, often in low-temperature hydrothermal conditions where iron oxides give it its characteristic yellow hue.
Uses & applications
Used primarily for lapidary work, jewelry (cabochons, beads), decorative ornaments, and as a popular stone for collectors and metaphysical practitioners.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone.' Yellow Jasper was historically used as a protective stone by travelers and shamans.
Field identification & locations
Identify by its opacity (even on thin edges), smooth waxy feel, and inability to be scratched by a steel knife. Commonly found in riverbeds, deserts, and coastal areas globally, notably in Brazil and India.
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