sedimentary
Jasper
Microcrystalline Quartz (Chalcedony), SiO2
Hardness of 6.5 to 7 on the Mohs scale, typically red, brown, yellow, or green due to iron oxide impurities, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58-2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, typically red, brown, yellow, or green due to iron oxide impurities, vitreous to dull luster, cryptocrystalline structure, conchoidal fracture, specific gravity of 2.58-2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary environments or hydrothermal veins, often replacing organic material or filling cavities in volcanic rocks.
Uses & applications
Used for making decorative objects, jewelry, cabochons, and as a collectible lapidary stone.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name means 'spotted or speckled stone'.
Field identification & locations
Can be identified in the field by its opaque appearance, waxy luster, hardness that scratches glass, and smooth conchoidal fracture. Found worldwide.
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