sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Rusty red to brownish-red, Luster: Dull to waxy, Crystal Structure: Microcrystalline (Trigonal), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91

Hardness: 6

Identified March 24, 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

Hardness: 6.5-7 (Mohs scale), Color: Rusty red to brownish-red, Luster: Dull to waxy, Crystal Structure: Microcrystalline (Trigonal), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58-2.91

Formation & geological history

Formed via the deposition of silica-rich fluids in volcanic or sedimentary rocks; the red color is due to the oxidation of iron (Hematite) during the lithification process. Common in prehistoric deposits over millions of years.

Uses & applications

Used extensively for lapidary work, jewelry (cabochons), ornamentation, and 'healing stones'. Historically used for seal stones and tools in ancient civilizations.

Geological facts

Red Jasper was known as the 'rain bringer' in some Native American cultures. It is a variety of Chalcedony and has been used by humans for thousands of years as jewelry and protective amulets.

Field identification & locations

Identify by its smooth texture, opaque red color, and inability to be scratched by a steel knife. Commonly found in riverbeds and desert regions worldwide, notably in the USA, Brazil, and India. Collectors should look for unique banding or patterns.