sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, typically opaque with a dull to greasy luster, variable colors (red, brown, yellow, green) due to iron or other mineral impurities, and conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically opaque with a dull to greasy luster, variable colors (red, brown, yellow, green) due to iron or other mineral impurities, and conchoidal fracture.
Formation & geological history
Forms from silica-rich solutions precipitating in sedimentary environments or hydrothermal veins, often replacing existing carbonate rocks, dating across various geological eras.
Uses & applications
Commonly used in ornamental carvings, jewelry, cabochons, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and weaponry components. Its name derives from the ancient Greek word for 'spotted stone'.
Field identification & locations
Easily identified by its opaque nature, high hardness, waxy luster, and colorful patterns. Found worldwide in riverbeds, glacial tills, and ancient sedimentary formations.
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