sedimentary
Jasper
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness: 6.5 to 7 on the Mohs scale, Color: Various shades of brown, red, green, or yellow often with intricate banding, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None, Specific gravity: 2.58 to 2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale, Color: Various shades of brown, red, green, or yellow often with intricate banding, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None, Specific gravity: 2.58 to 2.91
Formation & geological history
Forms through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often over millions of years.
Uses & applications
Used in ornamental carvings, cabochons, jewelry, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry, highly valued by ancient civilizations including the Greeks, Romans, and Egyptians.
Field identification & locations
Identified by its conchoidal fracture, high hardness that scratches glass, and opaque nature. Commonly found in riverbeds, glacial deposits, and sedimentary rock formations worldwide.
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