sedimentary
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
Hardness: 6.5 to 7 on the Mohs scale, Color: Red, brown, yellow, green, or multicolored, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Specific Gravity: 2.58 to 2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale, Color: Red, brown, yellow, green, or multicolored, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline/cryptocrystalline), Cleavage: None, Specific Gravity: 2.58 to 2.91
Formation & geological history
Formed through the accumulation of silica-rich sediments or volcanic ash, often precipitation from silica-rich fluids in marine or terrestrial environments, subjected to diagenesis over millions of years.
Uses & applications
Used for lapidary work, making ornamental objects, cabochons, jewelry, and polished display specimens.
Geological facts
Jasper has been used since ancient times to create seals, signets, and amulets. Red jasper gets its distinctive coloration from iron inclusions.
Field identification & locations
Easily identified by its opaque nature, smooth conchoidal fracture, and vibrant color patterns. Found worldwide in riverbeds, beaches, and mountainous regions.
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