sedimentary

Jasper

Silicon dioxide (SiO2)

Hardness: 6.5-7 on Mohs scale. Color: Red, yellow, brown, green, or multicolored. Luster: Vitreous to dull. Crystal structure: Microcrystalline quartz (chalcedony). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58-2.91.

Hardness: 6
Color: Red, yellow, brown, green, or multicolored
Luster: Vitreous to dull

Identified August 1, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from silica-rich solutions in sedimentary environments or volcanic ash, often through the replacement of organic material or deposition in marine environments. Can date back hundreds of millions of years.

Uses & applications

Used primarily for ornamental purposes, making cabochons, beads, carvings, and polished display pieces in lapidary arts.

Geological facts

Jasper has been used since ancient times for talismans, seals, and jewelry. The ancient Greeks and Romans valued it greatly for its protective properties.

Field identification & locations

Can be identified in the field by its opaque appearance, waxy-to-dull luster, conchoidal fracture, and hardness which easily scratches glass. Found worldwide, particularly in regions with historical volcanic or sedimentary activity.