sedimentary
Jasper
Silicon dioxide (SiO2) with impurities, microcrystalline quartz
AI-generated identification · may be incorrectHardness: 6.5-7 on the Mohs scale, Color: Brown, yellow, red, green, or multicolored, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (exhibits conchoidal fracture), Specific gravity: 2.55-2.70
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: Brown, yellow, red, green, or multicolored, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None (exhibits conchoidal fracture), Specific gravity: 2.55-2.70
Formation & geological history
Formed by the precipitation of silica-rich fluids in sedimentary environments, often involving volcanic ash or hydrothermal activity, over millions of years
Uses & applications
Used for ornamental objects, cabochons in jewelry, carvings, and as a collector specimen
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry due to its toughness and ability to take a fine polish
Field identification & locations
Can be identified in the field by its waxy to dull luster, smooth water-worn surface (if found in riverbeds), conchoidal fracture, and inability to be scratched by a steel knife. Commonly found in stream gravels and sedimentary rock formations worldwide
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