sedimentary

Banded Jasper

Silicon Dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Yellow, tan, and dark grey bands; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline quartz; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Yellow, tan, and dark grey bands
Luster: Vitreous to waxy

Identified June 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed via the deposition of silica-rich fluids in volcanic ash or sedimentary layers. The banding indicates rhythmic deposition or changes in chemical impurities like iron (yellow/brown) and manganese or carbon (grey) during formation.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons), river rock landscaping, and as a decorative collector's specimen.

Geological facts

Jasper is an opaque variety of chalcedony. The name 'jasper' comes from the Greek word 'iaspis', meaning 'spotted stone'. It is often found as water-worn pebbles in stream beds.

Field identification & locations

Identify in the field by its hardness (cannot be scratched by a steel knife), opaque nature, and smooth, waxy texture when wet or polished. Often found in riverbeds and coastal areas globally.