sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
Hardness: 6.5-7 on Mohs scale. Color: Opaque yellow to mustard brown with waxy luster. Physical properties: Conchoidal fracture, smooth texture, very fine-grained (microcrystalline).
- Hardness
- 6
- Color
- Opaque yellow to mustard brown with waxy luster
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Opaque yellow to mustard brown with waxy luster. Physical properties: Conchoidal fracture, smooth texture, very fine-grained (microcrystalline).
Formation & geological history
Formed primarily through the chemical precipitation of silica-rich fluids in ocean environments or as nodules replacing limestone or chalk. Can occur in sedimentary layers of various geological ages from Precambrian to Cenozoic.
Uses & applications
Commonly used in lapidary work and jewelry when polished. Historically used by ancient civilizations for making tools like scrapers and arrowheads due to its sharp edges when broken.
Geological facts
Yellow jasper is often associated with the solar plexus chakra in metaphysical beliefs. Despite its name, it is chemically identical to flint and agate, differing mostly in its formation environment and opaque color.
Field identification & locations
Identify in the field by its waxy-to-dull luster, smooth feel, and conchoidal (shell-like) fracture patterns. It is frequently found in riverbeds, glacial tills, and desert pavements worldwide.
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