sedimentary

Red Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 (Mohs scale); Color: Red, brownish-red; Luster: Vitreous to dull; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Red, brownish-red
Luster: Vitreous to dull

Identified June 21, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Red, brownish-red; Luster: Vitreous to dull; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Formation & geological history

Formed via the deposition of silica from water into cavities or cracks within other rocks, often associated with volcanic activity or deep-sea sedimentary environments. The red color is caused by iron (hematite) inclusions.

Uses & applications

Commonly used in jewelry (cabochons, beads), decorative carvings, lapidary arts, and as a popular stone for mineral collectors and metaphysical practitioners.

Geological facts

Red Jasper has been used since antiquity; it was known as the 'stone of endurance' and was used in ancient Egypt for amulets and in Minoan Crete for seals.

Field identification & locations

Identify in the field by its opaque red color, high hardness (cannot be scratched by a steel knife), and smooth, waxy feel when polished. It is frequently found in gravel beds and along riverbanks.