sedimentary

Red Jasper

Quartz (Microcrystalline silica), SiO2

Hardness of 6.5 to 7 on the Mohs scale, red to reddish-brown color due to iron inclusions, waxy to dull luster, cryptocrystalline crystal structure, conchoidal fracture with no true cleavage, and a specific gravity of 2.65 to 2.66.

Identified July 31, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of silica-rich sediments or volcanic ash, often in marine environments, with iron oxide impurities precipitating out to give it the characteristic red color. Geological age varies widely from Precambrian to Cenozoic.

Uses & applications

Commonly used in tumbled stones, cabochons for jewelry, decorative carvings, and mosaic tiles. Highly valued by lapidary artists and collectors.

Geological facts

Jasper has been used since ancient times for amulets, seals, and weaponry. It is mentioned in various historical texts and was prized by ancient Mesopotamians, Egyptians, and Greeks.

Field identification & locations

Identified by its opaque nature, reddish coloration, microcrystalline texture, and hardness that scratches glass. Found worldwide, with major deposits in India, Russia, Brazil, France, Germany, and the United States.

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