sedimentary

Jasper (specifically Red Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale); Color: Brick red to brownish-red; Luster: Dull to vitreous; Crystal Structure: Microcrystalline (Trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

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

Identified April 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, often associated with hydrothermal activity. Geological age varies greatly from Precambrian to Cenozoic.

Uses & applications

Used primarily in jewelry (cabochons, beads), decorative carvings, and as a popular semi-precious stone for mineral collectors.

Geological facts

The red color is caused by the presence of iron (hematite) impurities. Historically, it was known as the 'warrior's stone' and was used in ancient times for seals and talismans.

Field identification & locations

Identify in the field by its opaque red color, extreme hardness (it will scratch glass), and smooth, shell-like (conchoidal) fracture surfaces. Commonly found in riverbeds or areas with volcanic history.