sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Hardness: 6.5-7 (Mohs scale); Color: Tan, brown, olive green with landscape-like patterns; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Tan, brown, olive green with landscape-like patterns
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Tan, brown, olive green with landscape-like patterns; Luster: Vitreous to dull; Crystal structure: Microcrystalline/Cryptocrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the flow of silica-rich fluids through petrified mud or volcanic ash. The unique 'pictures' or patterns are created by trace minerals (like iron oxides) that settle into layers during the hydrothermal process or petrification over millions of years.
Uses & applications
Primarily used in jewelry making (beads, cabochons), lapidary art, and ornamental carvings. It is popular as a grounding stone in metaphysical practices and as a collector's specimen due to its scenic patterns.
Geological facts
Picture Jasper is often called 'the global stone' because its patterns often resemble map-like landscapes, deserts, or woods. Each piece is unique, meaning no two cut stones are exactly alike. It is a variety of Chalcedony.
Field identification & locations
Identify by its matte to semi-glossy polish and earthy, scenic banding that looks like a painting. Commonly found in the Pacific Northwest of the USA (particularly Oregon and Idaho), South Africa, and Brazil. In the field, look for opaque nodules with a high silica content that doesn't scratch easily with steel.
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