sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and mineral impurities
Hardness: 6.5–7 (Mohs scale); Color: Tan, brown, and ivory with landscape-like patterns; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific gravity: 2.58–2.91
- Hardness
- 6
- Color
- Tan, brown, and ivory with landscape-like patterns
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5–7 (Mohs scale); Color: Tan, brown, and ivory with landscape-like patterns; Luster: Vitreous to dull; Crystal structure: Hexagonal (microcrystalline/cryptocrystalline); Cleavage: None; Specific gravity: 2.58–2.91
Formation & geological history
Formed from the petrification of mud, silica-rich sediments, or volcanic ash. The unique patterns are caused by the flow of mineral-rich water (often iron or manganese) through the sediment before it fully hardens into stone. Most specimens are found in Neogene deposits (approximately 15-20 million years old).
Uses & applications
Primarily used in the lapidary arts for cabochons, beads, and decorative spheres. It is highly valued by collectors for its aesthetic 'landscape' patterns and by metaphysical practitioners who use it as a grounding stone.
Geological facts
Picture Jasper is often referred to as 'The Stone of Global Awareness'. One of the most famous varieties is 'Biggs Jasper' from Oregon, which features high-contrast 'hills and valleys' that look like desert paintings.
Field identification & locations
Identify in the field by its opaque, silicate nature and characteristic dendritic or layered brown/tan bands. Common locations include the Owyhee Mountains in Idaho and various desert regions in Oregon, USA. It is often found in nodules or large veins within volcanic ash beds.
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