sedimentary
Jasper (specifically Owyhee or Picture Jasper variety)
Jasper (Silicon Dioxide, SiO2)
Hardness: 6.5-7 (Mohs); Color: Tan, brown, and cream with scenic patterns; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Cryptocrystalline (Trigonal); Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Tan, brown, and cream with scenic patterns
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan, brown, and cream with scenic patterns; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Cryptocrystalline (Trigonal); Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed from volcanic ash or fine-grained silica-rich sediments that have been petrified and silicified through hydrothermal processes or mineral-rich groundwater over millions of years.
Uses & applications
Primarily used for lapidary arts including cabochons for jewelry, ornamental carvings, and high-end decorative tiles or paperweights due to its unique 'landscape' patterns.
Geological facts
Jasper is an opaque variety of chalcedony. The 'picture' naming refers to the dendritic or sediment-layer patterns that often resemble mountains, trees, or horizons when cut into slabs.
Field identification & locations
Identify in the field by its waxy to earthy texture, opacity (light will not pass through even thin edges), and distinctive banding or scenic patterns. Common in the Owyhee region of Oregon/Idaho, USA.
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