sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Deep brick red to brownish-red; Luster: Vitreous to dull; Crystal Structure: Trigonal (Microcrystalline); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.6-2.9.

Hardness: 6
Color: Deep brick red to brownish-red
Luster: Vitreous to dull

Identified March 31, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments, often associated with Banded Iron Formations (BIFs). The red color is caused by iron (hematite) impurities. It can range from Precambrian to modern in age.

Uses & applications

Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, lapidary art, and metaphysical purposes. Historically used for seals and tool making.

Geological facts

Red Jasper has been used by humans for thousands of years; it was a sacred stone in ancient Egypt often carved into protective amulets. It is an opaque variety of chalcedony.

Field identification & locations

Identify by its rich red color, opacity (it does not let light through even at thin edges), and inability to be scratched by a steel knife. Found globally, with major deposits in India, Brazil, South Africa, and the USA.