sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
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
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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).
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