sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth-tone colors including brown, red, and yellow, 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 earth-tone colors including brown, red, and yellow, conchoidal fracture with no true cleavage.
Formation & geological history
Formed from silica-rich solutions precipitating in marine or terrestrial environments, often originating from hydrothermal waters or as a chemical precipitate in silica-rich sediments.
Uses & applications
Used primarily for ornamental carvings, polished stones, cabochons in jewelry, and geological collecting.
Geological facts
Jasper has been used since ancient times to create seals, signet rings, and intricate carvings due to its durability and capacity to take a high polish.
Field identification & locations
Commonly found in stream beds and coastal areas as water-worn pebbles. Identified by its opacity, hardness, and smooth waxy luster after tumbling or weathering.
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