sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

AI-generated identification · may be incorrect

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

Identified June 14, 2026More sedimentary →

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Physical properties

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.