sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs), Color: Opaque red to brownish-red, Luster: Vitreous to dull, Crystal Structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9

Hardness: 6

Identified May 2, 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 primarily through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, occurring over millions of years. Its red color originates from high concentrations of iron oxide (hematite) during its formation.

Uses & applications

Commonly used in lapidary arts for cabochons, beads, and carvings. Historically used for seals, talismans, and decorative architecture. Widely used today as a pocket stone for spiritual/metaphysical collecting.

Geological facts

Red Jasper was historically known as the 'stone of endurance.' It is a variety of chalcedony that can contain up to 20 percent of foreign materials, which gives each specimen unique patterns or streaks.

Field identification & locations

Identify in the field by its opaque nature (unlike translucent carnelian), its high hardness (not scratched by a steel blade), and its conchoidal fracture. Often found in riverbeds or near areas of volcanic activity.