sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, colors range from brown, red, yellow to green, dull to greasy luster, cryptocrystalline structure, 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, colors range from brown, red, yellow to green, dull to greasy luster, cryptocrystalline structure, no cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed by the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often over millions of years, subjected to water tumbling which creates the smooth, rounded pebble shape.
Uses & applications
Used in lapidary arts, decorative items, tumbled stones, jewelry, and as collector specimens.
Geological facts
Jasper has been used since ancient times to create seals, talismans, and various ornaments. Its name means 'spotted or speckled stone'.
Field identification & locations
Found worldwide in riverbeds, beaches, and gravel deposits where water action has weathered and smoothed the rock. Identify by its high hardness, waxy luster, and opaque earthy tones.
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