sedimentary

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Brick red to brownish-red; Luster: Vitreous to waxy; Crystal Structure: Hexagonal (cryptocrystalline); Specific Gravity: 2.58-2.91

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

Identified July 6, 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: Hexagonal (cryptocrystalline); Specific Gravity: 2.58-2.91

Formation & geological history

Formed in sedimentary or hydrothermal environments where silica-rich fluids permeate through volcanic ash or sediment, with iron inclusions providing the red color. Often associated with Banded Iron Formations.

Uses & applications

Widely used for lapidary arts including cabochons, beads, and carvings; also used in decorative architectural stonework and historically as seals.

Geological facts

The name comes from the Greek word 'iaspis', meaning spotted stone. It has been used since antiquity in Knossos, Egypt, and by Native Americans who believed it brought rain and protection.

Field identification & locations

Identified by its deep red color, opacity, and smooth conchoidal fracture. Commonly found in South Africa, Brazil, India, and the United States (Oregon, Idaho).