sedimentary
Jasper Pebble
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, red, brown, and yellowish-brown color variations, opaque luster, trigonal crystal system, conchoidal fracture with no distinct 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, red, brown, and yellowish-brown color variations, opaque luster, trigonal crystal system, conchoidal fracture with no distinct cleavage, specific gravity of 2.58 to 2.91.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks, where silica-rich fluids replace original minerals over millions of years. Often shaped into smooth pebbles by water action in rivers or beaches.
Uses & applications
Commonly used in lapidary arts, tumbled stones, ornamental carvings, and low-cost jewelry making.
Geological facts
Jasper has been used since antiquity to create seals, talismans, and decorative items. The name comes from the ancient Greek word iaspis, meaning 'spotted stone'.
Field identification & locations
Easily identified by its opaque nature, hardness that scratches glass, smooth water-worn exterior, and rich earthy colors. Found globally in stream beds, gravel bars, and coastal beaches.
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