sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs); Color: Tan, brown, beige with dark dendritic or landscape-like patterns; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan, brown, beige with dark dendritic or landscape-like patterns; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None; Specific Gravity: 2.58-2.91.
Formation & geological history
Formed as a result of petrified mud or volcanic ash flows into silica-rich water. Over time, the ash/mud cools and gas/minerals create unique patterns. Most famous deposits date to the Tertiary period.
Uses & applications
Primarily used in jewelry (beads, cabochons), ornamental carvings, and metaphysical collecting.
Geological facts
The 'pictures' seen in the stone are actually dendritic formations or color variations caused by trace elements like iron oxide or manganese. It is often called the 'Earth Mother' stone due to its landscape-like appearance.
Field identification & locations
Identify in the field by its distinctive 'desert landscape' patterns and smooth, conchoidal fracture. Common in Idaho and Oregon (USA), particularly 'Biggs Jasper' or 'Deschutes Jasper'.
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