sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including red, brown, yellow, and green, 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, opaque luster, various earth tones including red, brown, yellow, and green, no cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Forms through the precipitation of silica-rich fluids in sedimentary basins or volcanic environments, often dating from the Precambrian to recent geologic eras.
Uses & applications
Used in lapidary arts, decorative stone carvings, jewelry, and as a collector's specimen.
Geological facts
Jasper has been used since ancient times for seals, talismans, and jewelry due to its durability and rich color patterns.
Field identification & locations
Identified by its opaque nature, waxy luster, and conchoidal fracture. Found worldwide in riverbeds, hydrothermal veins, and sedimentary rock formations.
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