sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

Hardness: 6.5-7 (Mohs scale); Color: Green with brownish/yellow veining; Luster: Vitreous to waxy; Crystal structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Hardness: 6
Color: Green with brownish/yellow veining
Luster: Vitreous to waxy

Identified June 28, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Green with brownish/yellow veining; Luster: Vitreous to waxy; Crystal structure: Trigonal (Microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91

Formation & geological history

Formed from the deposition of silica-rich fluids in volcanic or sedimentary environments. This specific river-worn pebble likely weathered out of a hydrothermal vein and was rounded by water action over thousands of years.

Uses & applications

Commonly used for lapidary work, cabochons, jewelry, decorative ornaments, and as a popular specimen for rock tumbling and collecting.

Geological facts

Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. Green jasper was highly prized in the ancient world for its supposed ability to bring rain and healing.

Field identification & locations

Identify in the field by its hardness (will scratch glass), opaque nature, and smooth, waxy texture when wet. Commonly found in riverbeds, gravel pits, and coastal areas near volcanic activity.