sedimentary
Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
Hardness of 6.5 to 7 on the Mohs scale, typically opaque with various earthy colors like red, brown, yellow, or green, vitreous to dull luster, and conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically opaque with various earthy colors like red, brown, yellow, or green, vitreous to dull luster, and conchoidal fracture.
Formation & geological history
Formed from silica-rich sediments or volcanic ash, often precipitated in marine environments or hydrothermal veins over millions of years.
Uses & applications
Used for ornamental objects, cabochons, jewelry, and lapidary art.
Geological facts
Jasper has been used since ancient times for seals, talismans, and jewelry due to its durability and attractive patterns.
Field identification & locations
Found worldwide in riverbeds and sedimentary deposits; identifiable by its opaque nature and hardness that can scratch glass.
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