sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, typically green with brownish or reddish patches, waxy to dull luster, cryptocrystalline structure, no cleavage, specific gravity of 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically green with brownish or reddish patches, waxy to dull luster, cryptocrystalline structure, no cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silicon dioxide-rich solutions precipitating in sedimentary environments or hydrothermal veins, often associated with volcanic activity and ancient ocean basins.
Uses & applications
Used for ornamental carvings, cabochons, jewelry, and as a popular specimen for rock collectors.
Geological facts
Jasper has been used throughout human history since ancient times for talismans, seals, and weaponry components due to its toughness and ability to take a high polish.
Field identification & locations
Identified by its conchoidal fracture, high hardness, opaque nature, and distinct earthy or multicolored patterns. Found worldwide in riverbeds, mountainous regions, and ancient sedimentary deposits.
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