sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
Hardness: 6.5-7 (Mohs scale); Color: Tan, brown, and red with landscape-like patterns; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None
- Hardness
- 6
- Color
- Tan, brown, and red with landscape-like patterns
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Tan, brown, and red with landscape-like patterns; Luster: Vitreous to waxy; Structure: Microcrystalline; Cleavage: None
Formation & geological history
Formed as a sedimentary stone where silica-rich fluids filled cavities in volcanic ash or sedimentary rocks, often during the Miocene epoch. The distinctive patterns are created by hydrothermal circulation of iron-rich fluids.
Uses & applications
Primarily used in jewelry making (cabochons, pendants), lapidary art, and as ornamental display pieces.
Geological facts
Picture jasper is famous for its 'hidden images' that often resemble desert landscapes, mountains, or tree branches. The most famous varieties come from the Owyhee Mountains in Oregon.
Field identification & locations
Identify in the field by its opaque, porcelain-like texture, lack of cleavage, and intricate, dendritic or banded patterns. It is commonly found in the Pacific Northwest of the USA.
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