sedimentary
Yellow Jasper
Cryptocrystalline Quartz (SiO2) with Goethite/Limonite inclusions
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Dull/Waxy to Vitreous when wet, Structure: Microcrystalline, Cleavage: None (Conchoidal fracture)
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Dull/Waxy to Vitreous when wet, Structure: Microcrystalline, Cleavage: None (Conchoidal fracture)
Formation & geological history
Formed when silica-rich fluids permeate through sediment or volcanic ash, slowly precipitating microcrystalline quartz. The yellow color is derived from iron hydroxide minerals like goethite.
Uses & applications
Used primarily for lapidary work, decorative cabochons, metaphysical crystals, and historically for making sharp-edged tools.
Geological facts
Jasper is incredibly durable and has been used by humans for thousands of years. It was a favorite stone for cylinder seals in ancient Mesopotamia.
Field identification & locations
Identify by its opacity (even on thin edges), its smooth conchoidal fracture, and it cannot be scratched by a steel knife. Frequently found in stream beds and coastal gravels.
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