sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, variable colors including red, brown, yellow, and green, vitreous to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture with no true 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, variable colors including red, brown, yellow, and green, vitreous to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich solutions precipitating in marine sediments or volcanic ash beds, often during ancient hydrothermal activity or diagenesis, spanning various geological ages.
Uses & applications
Used in ornamental carvings, gemstone jewelry, decorative items, and lapidary arts.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and jewelry, with references dating back to antiquity across various civilizations.
Field identification & locations
Found worldwide in association with iron-rich sedimentary deposits or hydrothermal veins; identified by its opaque nature, hardness, and waxy luster.
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