sedimentary
Jasper (Picture Jasper)
Quartz (Silicon Dioxide) - SiO2 with impurities
Hardness: 6.5-7 Mohs; Color: Tan, brown, and cream landscape patterns; Luster: Vitreous to waxy (when polished); Crystal Structure: Microcrystalline/Cryptocrystalline; Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Tan, brown, and cream landscape patterns
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 6.5-7 Mohs; Color: Tan, brown, and cream landscape patterns; Luster: Vitreous to waxy (when polished); Crystal Structure: Microcrystalline/Cryptocrystalline; Specific Gravity: 2.58-2.91.
Formation & geological history
Formed when silica-rich fluids permeate through volcanic ash or fine-grained sediments, slowly solidifying and trapping mineral impurities that create complex 'scenic' patterns. Often associated with the Tertiary period.
Uses & applications
Used primarily in jewelry (beads, cabochons), decorative carvings, and as a popular specimen for collectors.
Geological facts
Picture Jasper is often referred to as a 'global stone' because the patterns inside can look like landscapes, mountains, or forests. Every piece is unique due to the random nature of its formation.
Field identification & locations
Identified by its high hardness (won't be scratched by a knife) and characteristic earthy banded patterns. Often found in Idaho and Oregon, USA. Pieces are generally smooth and opaque.
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