sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, massive or microcrystalline crystal structure, conchoidal fracture, specific gravity around 2.58 to 2.91, and commonly displays brownish-red, yellow, or green colors due to iron oxide impurities.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, massive or microcrystalline crystal structure, conchoidal fracture, specific gravity around 2.58 to 2.91, and commonly displays brownish-red, yellow, or green colors due to iron oxide impurities.
Formation & geological history
Formed through the deposition of silica-rich fluids or silty sediments in marine or hydrothermal environments, often later undergoing diagenesis and weathering.
Uses & applications
Used in ornamental carvings, jewelry, lapidary arts, and as a decorative stone.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans by various civilizations including the ancient Greeks, Romans, and Egyptians.
Field identification & locations
Can be identified in the field by its waxy luster, hardness that scratches glass, and lack of cleavage. Commonly found in riverbeds and regions with ancient volcanic or sedimentary activity.
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