sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, colors vary widely including brown, yellow, red, and green due to impurities, waxy to vitreous luster, amorphous to cryptocrystalline crystal structure, no cleavage (conchoidal fracture), specific gravity around 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, colors vary widely including brown, yellow, red, and green due to impurities, waxy to vitreous luster, amorphous to cryptocrystalline crystal structure, no cleavage (conchoidal fracture), specific gravity around 2.58 to 2.91.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks where silica-rich fluids replace original materials over millions of years, often deposited in marine or terrestrial environments.
Uses & applications
Used for lapidary work, decorative cabochons, ornamental carvings, and gemstone collecting.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and decorative objects, and is mentioned in various historical and religious texts.
Field identification & locations
Commonly found in stream beds, gravel bars, and ocean beaches where water action has smoothed and tumbled the durable stone. Easily identifiable by its opacity, smooth conchoidal fracture, and rich earthy colors.
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