sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, various earth-tone colors often including tan, brown, red, or yellow, waxy to vitreous luster, cryptocrystalline structure, 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, various earth-tone colors often including tan, brown, red, or yellow, waxy to vitreous luster, cryptocrystalline structure, no true cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed from silica-rich solutions in sedimentary environments or hydrothermal veins, often accumulating in oceanic sediments or volcanic ash beds over millions of years.
Uses & applications
Used primarily in ornamental carvings, jewelry, tumbled stones, decorative objects, and lapidary arts.
Geological facts
Jasper has been utilized by ancient peoples since antiquity for tools, seals, and ornamentation. Its name means 'spotted or speckled stone'.
Field identification & locations
Commonly found in riverbeds and coastal areas as smooth pebbles due to natural tumbling. Identified by its hardness, opacity, and smooth conchoidal fracture.
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