sedimentary

Jasper

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 Mohs; Color: Dark green/grey with subtle inclusions; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91.

Hardness: 6
Color: Dark green/grey with subtle inclusions
Luster: Vitreous to dull

Identified June 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed primarily from the deposition of silica from water solutions into cracks and voids in volcanic or sedimentary rocks. This specimen appears to be a water-worn or tumbled pebble.

Uses & applications

Used extensively for lapidary work, jewelry (beads, cabochons), ornamental stone, and as a pocket stone for collectors.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning spotted stone. It has been used for seals and amulets since ancient times.

Field identification & locations

Identify by its hardness (cannot be scratched by a steel knife), opaque nature, and smooth, waxy surface when polished. Found globally in riverbeds or coastal areas.