sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green due to iron oxide impurities, conchoidal fracture with no true cleavage.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various colors including red, brown, yellow, and green due to iron oxide impurities, conchoidal fracture with no true cleavage.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks or the precipitation of silica-rich fluids in marine or terrestrial environments.
Uses & applications
Used for ornamental objects, jewelry, cabochons, and as a decorative stone in architecture.
Geological facts
Jasper has been used since antiquity to create seals, signet rings, and intricate carvings. Its name comes from the ancient Greek word for 'spotted stone'.
Field identification & locations
Easily identified by its opaque nature, smooth waxy polish, and vibrant earthy colors. Commonly found in riverbeds, coastal beaches, and areas of ancient volcanic or hydrothermal activity.
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