sedimentary
Picture Jasper
Silicified Mud or Siltstone (Silicon Dioxide, SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Tan, brown, and reddish-brown with landscape-like banding, Luster: Vitreous to dull, Crystal Structure: Microcrystalline (Trigonal), Cleavage: None, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Tan, brown, and reddish-brown with landscape-like banding, Luster: Vitreous to dull, Crystal Structure: Microcrystalline (Trigonal), Cleavage: None, Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the petrification of mud and silt layers by silica-rich fluids. The unique patterns are caused by localized flow of water or wind during the stone's formation, often in volcanic ash environments.
Uses & applications
Primarily used for jewelry, cabochons, decorative carvings, and as a popular specimen for rock collectors and metaphysical enthusiasts.
Geological facts
Picture Jasper is often called 'Nature's Canvas' because its patterns frequently resemble realistic landscapes, mountains, or deserts when cut into slabs.
Field identification & locations
Identify by its opaque, earthy tones and distinct wood-grain or landscape patterns. It is predominantly found in the Pacific Northwest, particularly Oregon, USA. Often found in riverbeds or areas with volcanic sedimentary deposits.
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