sedimentary
Banded Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
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
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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.
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