sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7.0 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

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

Identified April 6, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7.0 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Hexagonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed primarily as a secondary mineral in volcanic or sedimentary environments where silica-rich fluids permeate through rock cavities, often during the Proterozoic to Phanerozoic eons. Its red color comes from high concentrations of iron oxide (hematite).

Uses & applications

Used extensively in lapidary arts for jewelry, beads, cabochons, and small carvings. Historically used for making tools like scrapers due to its conchoidal fracture.

Geological facts

Jasper was a favorite gem in antiquity and is mentioned in many historical texts, including the Bible. The name comes from the Greek word 'iaspis', meaning spotted stone.

Field identification & locations

Identify by its smooth, waxy feel and characteristic shell-like (conchoidal) fracture pattern when broken. It cannot be scratched by a steel knife. Common in fossil-bearing beds and desert regions.