mineral

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

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

Hardness: 6
Color: Opaque red/brick-red
Luster: Vitreous to dull

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed via the deposition of silica from water solutions or volcanic ash into sedimentary or metamorphic environments. Its red color comes from iron oxide (hematite) inclusions incorporated during the cooling or sedimentation processes over millions of years.

Uses & applications

Commonly used in jewelry (cabochons, beads), decorative carvings, lapidary arts, and as a pocket stone for collectors. Historically used for seals and ornamentation.

Geological facts

In antiquity, Red Jasper was known as the 'stone of endurance' and was used by many cultures including Ancient Egyptians for amulets and protective scarabs. It is a microcrystalline variety of quartz.

Field identification & locations

Identify in the field by its deep red color, opacity (light does not pass through), and its ability to scratch glass but not be scratched by a steel knife. Frequently found in riverbeds, deserts, and volcanic regions globally, including the USA, Brazil, and India.

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