sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness: 6.5-7 on the Mohs scale; Color: Red, brown, yellow, green, or multicolored; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.55-2.70
- Hardness
- 6
- Color
- Red, brown, yellow, green, or multicolored
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Red, brown, yellow, green, or multicolored; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None, exhibits conchoidal fracture; Specific gravity: 2.55-2.70
Formation & geological history
Formed from silica-rich solutions precipitating in marine or terrestrial environments, often associated with volcanic activity or iron-rich sediments, typically over millions of years.
Uses & applications
Used for ornamental objects, cabochons, jewelry, carvings, and as a popular collecting specimen.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The name means 'spotted or speckled stone' from ancient Greek.
Field identification & locations
Found worldwide in riverbeds, glacial tills, and sedimentary rock formations. Identified by its opacity, hardness, smooth conchoidal fracture, and rich earthy colors.
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