sedimentary

Red Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

AI-generated identification · may be incorrect

Hardness: 6.5-7 on the Mohs scale, Color: Red to reddish-brown due to iron inclusions, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified August 6, 2026More sedimentary →

Explore Red Jasper in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through the precipitation of silica-rich fluids in sedimentary environments or altered volcanic ash, often associated with hydrothermal activity and ancient ocean basins. Geological age varies widely from Precambrian to Cenozoic.

Uses & applications

Used in ornamental stone carving, cabochons, polished decorative objects, jewelry, and by mineral collectors.

Geological facts

Red jasper has been used since ancient times for talismans, seals, and jewelry. The red color comes from iron oxide impurities trapped within the microcrystalline quartz matrix.

Field identification & locations

Easily identified in the field by its opaque red color, waxy-to-dull luster, and characteristic conchoidal fracture. Commonly found in riverbeds, glacial tills, and areas with ancient hydrothermal deposits worldwide.