sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz)
Hardness: 6.5-7 on Mohs scale; Colors: brown, red, yellow, green, or multicolored; Luster: vitreous to dull; Crystal structure: trigonal (microcrystalline/cryptocrystalline); Cleavage: none (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Luster
- vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale; Colors: brown, red, yellow, green, or multicolored; Luster: vitreous to dull; Crystal structure: trigonal (microcrystalline/cryptocrystalline); Cleavage: none (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Forms by the precipitation of silica from aqueous solutions, often in marine or volcanic environments, typically during the diagenesis of silica-rich sediments or volcanic ash beds.
Uses & applications
Used for ornamental objects, cabochons, carved gemstones, tumbling, and decorative lapidary arts.
Geological facts
Jasper has been used since ancient times to create seals, signet rings, and intricate carvings due to its durability and capacity to take a fine polish.
Field identification & locations
Found worldwide in sedimentary and volcanic rock formations; identified easily by its opaque appearance, waxy-to-dull luster, conchoidal fracture, and lack of crystal faces.
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