sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay inclusions
Hardness: 6.5-7 (Mohs). Color: Cream, tan, brown, black, and red banding. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (Microcrystalline). Cleavage: None (Conchoidal fracture). Specific Gravity: 2.6-2.7.
- Hardness
- 6
- Color
- Cream, tan, brown, black, and red banding
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs). Color: Cream, tan, brown, black, and red banding. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (Microcrystalline). Cleavage: None (Conchoidal fracture). Specific Gravity: 2.6-2.7.
Formation & geological history
Formed from silica-rich petrified mud or volcanic ash flows. As the silica hardened into jasper, movement and fluid percolation created the distinctive 'landscape' or 'picture' patterns through the deposition of iron oxide minerals and clays.
Uses & applications
Primarily used in lapidary arts, jewelry (cabochons), interior decoration, and as a popular specimen for collectors due to its scenic patterns.
Geological facts
Picture Jasper is often called the 'Global Awareness' stone because its patterns can look like landscapes from all over the world. It is a form of chalcedony that is specifically opaque.
Field identification & locations
Identify by its opaque, colorful banding and ability to take a high polish. It will scratch glass but cannot be scratched by a steel pocketknife. Commonly found in the Pacific Northwest of the USA, especially Oregon.
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