sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 on Mohs scale; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline; 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/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water into cracks or cavities of sedimentary rocks, often enriched with iron oxide which provides the yellow pigment. Typically formed in the Tertiary period or older.
Uses & applications
Commonly used in jewelry as cabochons, decorative carvings, pocket stones for metaphysical practices, and as an abrasive in industrial applications.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It was highly prized in the ancient world for its protective properties.
Field identification & locations
Look for an opaque, dull to waxy luster and a smooth, rounded surface if water-worn. Common in river beds and shores in regions like Madagascar, India, and the Western USA. It will not scratch with a pocket knife.
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