sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Opaque brick red to brownish-red. Luster: Vitreous to waxy. Crystal Structure: Hexagonal/Trigonal (Microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Opaque brick red to brownish-red
Luster: Vitreous to waxy

Identified June 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed primarily through the deposition of silica-rich fluids in volcanic or sedimentary environments. The red color comes from high concentrations of iron oxide (hematite) that were trapped as the silica solidified into cryptocrystalline quartz. It is often found in prehistoric sedimentary deposits.

Uses & applications

Used extensively in jewelry for cabochons and beads, ornamental carvings, seals, and as a decorative stone in mosaics and garden landscaping. It is also a popular specimen for rock tumbling.

Geological facts

Red Jasper was historically known as the 'Stone of Endurance' and was used by ancient civilizations for protective amulets. It is an opaque variety of chalcedony. Some civilizations believed it could stop bleeding and increase fertility.

Field identification & locations

Identify in the field by its deep red color, opacity (light will not pass through edges), and its smooth, glass-like fracture. It is commonly found in riverbeds, desert landscapes, and regions with ancient volcanic activity like the Western United States, South Africa, and Brazil.