sedimentary

Red Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Hardness of 6.5 to 7 on the Mohs scale, reddish-brown to brick-red color, dull to waxy luster, microcrystalline or cryptocrystalline crystal structure, conchoidal fracture with no cleavage, specific gravity around 2.65.

Identified July 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the precipitation of silica-rich fluids in marine or terrestrial environments, often accumulating in sedimentary beds or volcanic hydrothermal settings. Geological age varies widely depending on the deposit, ranging from Precambrian banded iron formations to younger sedimentary basins.

Uses & applications

Used in ornamental carvings, cabochons, polished stones, tumbled stones, jewelry, and lapidary art.

Geological facts

Red Jasper has been used since ancient times for talismans, seals, and weaponry like arrowheads due to its conchoidal fracture. Its deep red color comes from iron oxide impurities trapped within the silica matrix.

Field identification & locations

Can be identified in the field by its opaque red-brown color, waxy-to-dull luster, and hard, glassy conchoidal breaks. Commonly found globally in association with jasper-bearing iron formations, riverbeds, and quartz veins.

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