sedimentary

Red Jasper

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Mohs hardness of 6.5 to 7. Dull to vitreous or waxy luster. Deep red to reddish-brown coloration caused by hematite or iron inclusions. Microcrystalline quartz structure with conchoidal fracture and no cleavage. Specific gravity around 2.58-2.91.

Identified July 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed primarily through the deposition of silica-rich sediments or hydrothermal fluids penetrating volcanic ash and sedimentary layers, where microcrystalline quartz precipitates along with iron oxides over millions of years.

Uses & applications

Widely used for ornamental carvings, lapidary arts, cabochons, beads, and tumbled stones. Historically used for seals, tools, and decorative inlays. Popular among rockhounds and mineral collectors.

Geological facts

Red Jasper has been prized since antiquity; ancient civilizations like the Egyptians and Greeks used it as a stone of protection, strength, and healing. It is an opaque variety of chalcedony.

Field identification & locations

Identified by its rich red color, high hardness (scratches glass, cannot be scratched by a steel nail), conchoidal fracture, and opaque appearance. Commonly found along riverbeds, gravel bars, and volcanic terrains worldwide, including the Western United States, South Africa, and India.

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