sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Deep brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9

Hardness: 6
Color: Deep brownish-red
Luster: Vitreous to dull

Identified July 1, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Deep brownish-red; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, typically undergoing diagenesis. The red color is caused by the presence of hematite/iron oxide.

Uses & applications

Commonly used for ornamental carvings, jewelry (cabochons), tumbled stones, and as a healing stone in spiritual practices.

Geological facts

Jasper is an opaque variety of chalcedony. It has been used since ancient times for seals, talismans, and decorative architecture. It was once called the 'supreme nurturer' in ancient cultures.

Field identification & locations

Identify by its rich red color, extreme hardness (won't be scratched by a steel blade), and smooth, waxy fracture surface. It is commonly found in riverbeds and arid regions globally, including India, Brazil, and the Southwestern US.