sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None; SG: 2.6-2.9
- Hardness
- 6
- Color
- Mustard yellow, golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow, golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None; SG: 2.6-2.9
Formation & geological history
Formed through the infiltration of silica-rich fluids into sedimentary or volcanic rocks, where mineral impurities like iron oxide provide the distinct yellow hue.
Uses & applications
Used primarily for lapidary work, jewelry (beads, cabochons), tumbled stones for crystal healing, and decorative ornaments.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. It was highly prized in the ancient world for its supposed protective qualities.
Field identification & locations
Identified by its opacity, conchoidal fracture, and inability to be scratched by a steel knife. Common in Brazil, India, South Africa, and the western United States.
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