mineral

Jasper Agate

Chalcedony (Silicon Dioxide - SiO2)

Hardness: 6.5-7 on Mohs scale; Color: Multi-colored bands / translucent white and opaque olive-green; Luster: Waxy to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6

Hardness: 6
Luster: Waxy to vitreous

Identified March 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the secondary deposition of silica-rich groundwaters in the cavities of volcanic rocks or sedimentary formations. Many specimens found in riverbeds are thousands to millions of years old, weathered and polished by water action.

Uses & applications

Used primarily in lapidary arts for cabochons, beads, and jewelry. Also popular in landscaping, aquarium decor, and as pocket stones for collectors.

Geological facts

This specimen is a 'Jasper Agate,' a transitional stone where opaque jasper and translucent agate intermix. Jasper and Agate are both varieties of chalcedony, differentiated mainly by their transparency.

Field identification & locations

Identify by its 'waxy' appearance when dry and its hardness (it should easily scratch glass but cannot be scratched by a steel knife). Commonly found in riverbeds, gravel pits, and along coastlines. Collectors often look for unique banding patterns.