sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Hardness: 6.5-7 (Mohs). Color: Brick-red to brownish-red. Luster: Dull to vitreous. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Brick-red to brownish-red
Luster: Dull to vitreous

Identified July 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Its distinctive red color is caused by the presence of iron oxide (hematite) during formation.

Uses & applications

Used primarily for decorative objects, jewelry (cabochons and beads), ornamental stone, and as a component in lapidary work. In ancient times, it was used for seals and amulets.

Geological facts

Red Jasper has been used by various cultures for thousands of years. It was known as the 'rain bringer' in some indigenous cultures and was considered a stone of protection and endurance by ancient warriors.

Field identification & locations

Identify by its opaque red color and high hardness (it will scratch glass and cannot be scratched by a steel knife). Commonly found in riverbeds, deserts, and coastal areas where volcanic and sedimentary rocks interact.

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