sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness: 6.5 to 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: 2.58 to 2.91
- Hardness
- 6
- Color
- Red, brown, yellow, green, or multicolored
- Luster
- Vitreous to dull
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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); Cleavage: None (exhibits conchoidal fracture); Specific Gravity: 2.58 to 2.91
Formation & geological history
Formed by the precipitation of silica-rich fluids in sedimentary environments or hydrothermal solutions, often replacing organic material or filling fractures in existing rocks.
Uses & applications
Used primarily for ornamental objects, cabochons, carved items, jewelry, and by mineral collectors.
Geological facts
Jasper has been used since ancient times to create seals, signet rings, and various ornaments. The red color is typically due to iron oxide inclusions.
Field identification & locations
Can be identified by its opaque nature, waxy to vitreous polish, and conchoidal fracture. Commonly found in riverbeds, glacial tills, and mountainous regions worldwide.
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