sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
Hardness: 6.5-7 (Mohs), Color: Yellow-brown/ochre, Luster: Waxy to dull, Crystal Structure: Cryptocrystalline, Fracture: Conchoidal, Specific Gravity: 2.6
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Yellow-brown/ochre, Luster: Waxy to dull, Crystal Structure: Cryptocrystalline, Fracture: Conchoidal, Specific Gravity: 2.6
Formation & geological history
Formed by the precipitation of silica from groundwater or within sedimentary rock layers like limestone. It is often ancient, dating back hundreds of millions of years, frequently found as nodules in Marine environments.
Uses & applications
Used historically for stone tools due to its sharp edges; today used for lapidary work, jewelry (as jasper), and as a decorative landscaping stone.
Geological facts
Yellow jasper is often associated with the solar plexus chakra in metaphysical beliefs. It is a very durable stone that resists chemical weathering well.
Field identification & locations
Look for a smooth, waxy surface and a shell-like (conchoidal) fracture pattern. It will easily scratch glass and cannot be scratched by a steel knife. Common in riverbeds and gravel pits.
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