sedimentary
Jasper pebble (Yellow/Brown Jasper)
Silicon Dioxide (Microcrystalline Quartz, SiO2 with Iron Oxide impurities)
Hardness: 6.5-7 on Mohs scale; Color: yellowish-brown, tan, and grayish-green mottled hues; Luster: waxy to dull; Fracture: conchoidal; Diaphaneity: opaque
- Hardness
- 6
- Color
- yellowish-brown, tan, and grayish-green mottled hues
- Luster
- waxy to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: yellowish-brown, tan, and grayish-green mottled hues; Luster: waxy to dull; Fracture: conchoidal; Diaphaneity: opaque
Formation & geological history
Formed through the accumulation and silicification of fine-grained sediment or volcanic ash, saturated with silica-rich water containing iron hydroxide oxides. Rounded by stream or beach water erosion over geological timescales.
Uses & applications
Used in lapidary arts, decorative rock collections, tumbled stone jewelry, and landscape ornamentation.
Geological facts
Jasper is a cryptocrystalline variety of chalcedony that owes its distinct opaque colors to inclusions of iron oxides, hydroxides, and clays.
Field identification & locations
Identified by its smooth, water-worn exterior, high hardness (cannot be scratched by steel), opaque clarity, and waxy luster when clean. Commonly found along riverbeds, lakeshores, and gravel deposits worldwide.
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