sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale; Color: Brick red to brownish red with darker patterns; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None/Conchoidal fracture; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish red with darker patterns
Luster: Vitreous to dull

Identified May 18, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms in hydrothermal veins or sedimentary environments where silica-rich fluids permeate porous rocks or volcanic ash. The red color is caused by iron (hematite) inclusions within the dense silica mass.

Uses & applications

Widely used as a gemstone for jewelry, lapidary and decorative carvings, meditation stones, and historically as seal stones or amulets.

Geological facts

Red Jasper was traditionally known as the 'stone of endurance' in ancient cultures. It is a dense, opaque variety of chalcedony that does not show light through the edges compared to carnelian or agate.

Field identification & locations

Identify by its deep red color, opacity, and ability to scratch glass. Found globally, prominent sources include Brazil, France, Germany, India, Russia, and the USA (California and Oregon).