mineral

Red Jasper

Silicon Dioxide (SiO2) - variety Jasper

Hardness: 6.5-7 Mohs; Color: Brick red to brownish red due to iron inclusions; Luster: Dull to vitreous; Crystal Structure: Microcrystalline/Cryptocrystalline (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish red due to iron inclusions
Luster: Dull to vitreous

Identified June 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich fluids filling fissures or voids in other rocks, often associated with volcanic activity or hydrothermal processes. The red color is caused by finely dispersed Hematite (iron oxide).

Uses & applications

Commonly used in lapidary work for cabochons, beads, and carvings. Historically used for seals and amulets. Also used as a decorative stone in jewelry and as ornamental gravel.

Geological facts

In antiquity, Red Jasper was known as the 'stone of endurance' and was worn by warriors to provide strength. It is a variety of Chalcedony, which is itself a microcrystalline variety of Quartz.

Field identification & locations

Identify by its waxy to dull luster on fresh surfaces, conchoidal (shell-like) fracture, and inability to be scratched by a steel knife. Frequently found in riverbeds or as nodules in desert pavements.