sedimentary
Jasper
Silicon dioxide (SiO2) microcrystalline quartz
Hardness of 6.5 to 7 on the Mohs scale, typically yellow, brown, red, or green, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, 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 yellow, brown, red, or green, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids or silty sediments in marine or terrestrial environments, often altered by hydrothermal activity or diagenesis over millions of years.
Uses & applications
Used for making jewelry, ornamental carvings, decorative objects, and historically for stone tools and weapons.
Geological facts
Jasper has been used by humans since ancient times for talismans, seals, and weaponry. Its name means 'spotted or speckled stone.'
Field identification & locations
Found worldwide in sedimentary deposits, stream beds, and weathering zones. Identified by its waxy luster, opaque nature, and conchoidal fracture.
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