sedimentary
Picture Jasper
Silicified sedimentary or volcanic rock (primarily SiO2)
Hardness: 6.5-7 (Mohs); Color: Tan, brown, and green with dark dendritic or landscape-like patterns; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Gravity: 2.58-2.91
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan, brown, and green with dark dendritic or landscape-like patterns; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Gravity: 2.58-2.91
Formation & geological history
Formed over millions of years when silica-rich minerals or volcanic ash deposits were petrified by groundwater, with iron oxides and other impurities creating unique patterns. Found primarily in Cenozoic era deposits.
Uses & applications
Primarily used as a gemstone for jewelry, lapidary cabochons, and decorative ornamental items. Highly valued by collectors for the 'pictures' or landscapes visible in its patterns.
Geological facts
Known as the 'Stone of Global Awareness,' it is unique because the intricate patterns are formed by mineral flow and weather-like conditions during crystallization, often mimicking natural landscape scenes.
Field identification & locations
Identify by its characteristic 'landscape' patterns and high hardness that takes a glass-like polish. Commonly found in the Pacific Northwest of the USA (notably Oregon) and South Africa.
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