sedimentary
Picture Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness: 6.5 - 7 (Mohs); Color: Tan, beige, or brown with dark dendritic or line patterns; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58 - 2.91
- Hardness
- 6
- Color
- Tan, beige, or brown with dark dendritic or line patterns
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5 - 7 (Mohs); Color: Tan, beige, or brown with dark dendritic or line patterns; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58 - 2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary environments. Its unique 'pictures' or landscapes are created by the infiltration of iron oxide or manganese into mud or volcanic ash during solidification. Most notable deposits formed during the Tertiary Period.
Uses & applications
Primarily used for ornamental purposes, lapidary art, jewelry (cabochons, beads), and as a collector's specimen. It is popular in metaphysical circles as a grounding stone.
Geological facts
Picture Jasper is often called the 'Earth Mother' stone. The 'scenery' visible in more complex pieces can look remarkably like deserts or mountain ranges. High-quality specimens with distinct 'images' are highly sought after by collectors.
Field identification & locations
Identify by its matte to waxy appearance and distinctive dark lines that resemble hand-drawn landscapes. It is opaque and cannot be scratched by a steel knife. Major localities include Oregon (Biggs Jasper, Deschutes Jasper) and Idaho in the USA.
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