sedimentary

Red Jasper

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale), Color: Deep red to brownish-red, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Cleavage: None, Specific gravity: 2.58-2.91

Hardness: 6

Identified June 6, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale), Color: Deep red to brownish-red, Luster: Vitreous to dull, Crystal structure: Trigonal/Microcrystalline, Cleavage: None, Specific gravity: 2.58-2.91

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments. Its red color is derived from high iron content (hematite inclusions). It is found in many geological time periods ranging from Precambrian to recent formations.

Uses & applications

Commonly used in jewelry for cabochons and beads, ornamental carvings, and as a healing stone in metaphysical practices. Historically used for seals and decorative inlays.

Geological facts

Ancient Egyptians associated red jasper with the blood of Isis and used it for protective amulets. It is a microcrystalline variety of quartz and can contain up to 20% foreign materials which determine its opacity and color.

Field identification & locations

Identified in the field by its waxy-to-dull luster, smooth conchoidal fracture, and extreme hardness (cannot be scratched by a steel knife). Commonly found in riverbeds or as nodules in volcanic terrains. Large deposits are found in India, Brazil, Madagascar, and the USA.