sedimentary

Banded Jasper

Silicon Dioxide (SiO2) with iron oxide and clay impurities

Hardness: 6.5-7 (Mohs scale); Color: Variegated brown, red, yellow, and green bands; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91

Hardness: 6
Color: Variegated brown, red, yellow, and green bands
Luster: Vitreous to waxy

Identified March 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or hydrothermal fluids in volcanic or sedimentary environments. These distinct bands are created by the rhythmic precipitation of different mineral oxides over time, often during the Precambrian to Paleozoic eras.

Uses & applications

Predominantly used for lapidary work, jewelry (cabochons), ornamental carvings, and as a popular collector's pocket stone or decorative aggregate.

Geological facts

Jasper is a variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, jasper with banded patterns was believed to bring rain and protect against negative energy.

Field identification & locations

Identify in the field by its opacity (unlike translucent agate) and distinct color banding. It cannot be scratched by a steel knife. Common locations include the Western United States (Oregon, Idaho), Australia, India, and Brazil.

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