sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 Mohs; Color: Tan, brown, or ivory with complex banding; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Tan, brown, or ivory with complex banding
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Tan, brown, or ivory with complex banding; Luster: Vitreous to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91.
Formation & geological history
Formed from the petrification of mud, sand, or volcanic ash in water. The 'picture' or landscape-like banding is created by the flow of mineral-rich water and variation in iron oxide levels during its formation, often dating back to the Miocene epoch.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and ornamental carvings. It is popular in jewelry and for meditation practices.
Geological facts
Picture Jasper is often referred to as a 'global stone' because its patterns frequently look like maps or landscapes from around the world. Famous varieties include Biggs and Owyhee Jaspers.
Field identification & locations
Identify by its matte to semi-glossy tan background with distinct wavy dark brown stripes or dendritic patterns. It is most famously found in Idaho and Oregon, USA. Collectors should look for patterns that resemble mountains or horizons.
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