sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron impurities
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow, ochre, sandy brown; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow, ochre, sandy brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Mustard yellow, ochre, sandy brown; Luster: Vitreous to waxy; Structure: Cryptocrystalline; Cleavage: None; Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, often associated with hydrothermal activity. Geological age varies widely by location, from Precambrian to Cenozoic eras.
Uses & applications
Primarily used in jewelry (beads, cabochons), ornamental carvings, and as a decorative stone in landscaping. Historically used for making tools due to its conchoidal fracture.
Geological facts
Yellow Jasper was historically considered a powerful protection stone for travelers. Its yellow color comes from the high concentrations of iron oxide (goethite or limonite) embedded within the quartz structure.
Field identification & locations
Identify in the field by its opaque nature, smooth waxy feel when wet, and conchoidal (glass-like) fracture patterns. Frequently found in riverbeds, desert pavements, and volcanic regions globally.
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