sedimentary
Jasper
Silicon dioxide (Microcrystalline Quartz, SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown/orange; Luster: Dull to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Reddish-brown/orange
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Reddish-brown/orange; Luster: Dull to waxy; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water, often in volcanic or sedimentary environments where iron oxides provide the distinct coloration. Common in regions with ancient sedimentary basements.
Uses & applications
Used primarily as a gemstone in jewelry, decorative carvings, and as a popular specimen for mineral collectors.
Geological facts
Jasper has been used for millennia for seals and amulets. The name comes from the Greek word 'iaspis', meaning spotted stone, though this specimen appears relatively uniform.
Field identification & locations
Found globally but consistent with the sedimentary and river basin geology of the Saratov region in Russia. Identify in the field by its hardness (will scratch glass) and smooth, non-porous surface.
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