sedimentary
Red Jasper Pebble
Microcrystalline Quartz (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, red to reddish-brown color due to iron oxide inclusions, waxy to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture with no true cleavage, specific gravity around 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, red to reddish-brown color due to iron oxide inclusions, waxy to dull luster, cryptocrystalline or microcrystalline structure, conchoidal fracture with no true cleavage, specific gravity around 2.65.
Formation & geological history
Formed through the accumulation of silica-rich sediments or volcanic ash on ocean floors, often chemically precipitated in marine environments. Over geological time, pressure and low-grade metamorphism or diagenesis cement the silica into a dense rock.
Uses & applications
Used primarily in ornamental carvings, cabochons for jewelry, tumbled stones, and decorative aggregate.
Geological facts
Jasper has been used since ancient times for amulets, seals, and tools. Red jasper specifically was valued in ancient Egypt and by Native American tribes for its grounding energy and protective qualities.
Field identification & locations
Found easily in riverbeds, glacial tills, and marine beaches where wave action has smoothed and rounded the resistant quartz pebbles. Easily identified by its hardness, opacity, waxy luster, and distinctive red color.
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