sedimentary

Banded Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Brown, tan, red, and dark brown bands; Luster: Dull to Vitreous; Structure: Microcrystalline (Trigonal system); Cleavage: None; Specific Gravity: 2.6-2.9

Hardness: 6
Color: Brown, tan, red, and dark brown bands
Luster: Dull to Vitreous

Identified July 1, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Brown, tan, red, and dark brown bands; Luster: Dull to Vitreous; Structure: Microcrystalline (Trigonal system); Cleavage: None; Specific Gravity: 2.6-2.9

Formation & geological history

Formed through the precipitation of silica from volcanic fluids or in hydrothermal veins, becoming layered with iron oxide and other mineral impurities during sedimentary processes. Typically dates from the Precambrian to Cenozoic eras.

Uses & applications

Commonly used for lapidary work, jewelry making (cabochons), interior decoration, and as a popular specimen for rock collectors and metaphysical enthusiasts.

Geological facts

The banding in Jasper is often caused by the rhythmic precipitation of different mineral impurities, creating 'landscape' or 'picture' patterns that are highly sought after by collectors.

Field identification & locations

Identify by its waxy feel, distinct layering, and extreme hardness (it will scratch glass). Commonly found in desert regions, riverbeds, and areas with high volcanic/sedimentary history like the Western United States and Australia.