sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale); Color: Polychrome/multi-colored displaying bands of tan, brown, yellow, and red; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Polychrome/multi-colored displaying bands of tan, brown, yellow, and red; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic ash or sedimentary layers. The distinct 'landscape' or 'picture' patterns are created by the oxidation of iron and other minerals during the flow of hydrothermal fluids.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and decorative carvings. Highly valued by collectors for its aesthetic 'scenic' patterns.
Geological facts
This specific variety is often called 'Picture Jasper' or 'Deschutes Jasper' because its unique color bands often resemble landscapes, deserts, or mountains.
Field identification & locations
Identify in the field by its hardness (it will scratch glass), its opaque nature, and its smooth, shell-like fracture pattern. Often found in riverbeds or arid regions like Oregon and Idaho, USA.
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