sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale, opaque luster, various colors including grey, brown, and black due to impurities, conchoidal fracture.
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Physical properties
Hardness of 6.5-7 on the Mohs scale, opaque luster, various colors including grey, brown, and black due to impurities, conchoidal fracture.
Formation & geological history
Formed from silica-rich solutions precipitating in sedimentary environments or hydrothermal veins, often weathered and water-worn into pebbles over millions of years.
Uses & applications
Used in lapidary arts, ornamental objects, tumbling, and crystal collections.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name means 'spotted or speckled stone'.
Field identification & locations
Found worldwide in riverbeds and beaches; identified by its hardness, lack of cleavage, and smooth water-worn surface.
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