sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Brick red to brownish red; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Brick red to brownish red
Luster: Vitreous to waxy

Identified June 28, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 Mohs; Color: Brick red to brownish red; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Formation & geological history

Formed from silica-rich fluids (often in volcanic hot springs or sedimentary deposits) that permeate through rocks, accumulating iron oxides which provide the red color. Typically dates from the Precambrian to Cenozoic eras.

Uses & applications

Commonly used in lapidary arts for cabochons, beads, and carvings. Also used as a decorative stone in jewelry, ornaments, and occasionally as an industrial abrasive in high-end polishing powders.

Geological facts

Jasper was a favorite gem in antiquity and is mentioned in many ancient texts; the name comes from the Greek word 'iaspis', meaning 'spotted stone'. It is an opaque variety of chalcedony.

Field identification & locations

Identify in the field by its opaque nature, smooth conchoidal fracture, and inability to be scratched by a steel knife. It is frequently found in riverbeds, desert pavements, and coastal areas, particularly in Western USA, India, Russia, and Brazil.