sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness: 6.5-7 on the Mohs scale, Color: Red, brown, yellow, green, or multicolored, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline)
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: Red, brown, yellow, green, or multicolored, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline)
Formation & geological history
Forms from silica-rich solutions precipitating in sedimentary environments or hydrothermal veins, often accumulating in nodular masses.
Uses & applications
Used in ornamental carvings, jewelry, cabochons, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name comes from the Greek word iaspe, meaning 'spotted stone'.
Field identification & locations
Commonly found in riverbeds, glacial tills, and weathering zones worldwide. Identified by its opaque nature and conchoidal fracture.
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