sedimentary
Picture Jasper
Silicon Dioxide (SiO2) - Opaque Impure Chalcedony
Hardness: 6.5-7 (Mohs); Color: Tan, brown, ochre, and cream with landscape-like patterns; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Tan, brown, ochre, and cream with landscape-like patterns
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan, brown, ochre, and cream with landscape-like patterns; Luster: Vitreous to waxy; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed by the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments during the Cenozoic era. The distinct patterns are created by iron oxides or other mineral inclusions that reveal flow patterns or fossilized mud during high-pressure petrifaction.
Uses & applications
Primary use in lapidary arts for cabochons, beads, and pendants. Highly valued by collectors for the 'scenic' images it produces and used in interior design as decorative tiles or ornamental stones.
Geological facts
Many famous specimens originate from the Pacific Northwest, specifically Oregon's Biggs Junction or Deschutes areas. It is often called the 'Earth Mother' stone by practitioners who believe its patterns depict geographical scenes from the planet's past.
Field identification & locations
Identify in the field by its high hardness (won't scratch with a steel knife), opaque density, and characteristic banding or dendritic patterns. Common locations include the high deserts of Oregon, Idaho, and South Africa.
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