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 through the accumulation of silica-rich sediments or silica deposition in hydrothermally active areas, often associated with precipitation of silica in marine or volcanic environments.
Uses & applications
Used primarily in lapidary work, ornamental carvings, jewelry, and as a collectible specimen.
Geological facts
Jasper has been used since ancient times for creating seals, talismans, and jewelry, and is mentioned in various historical texts.
Field identification & locations
Can be identified in the field by its waxy luster, conchoidal fracture, and inability to be scratched by a steel knife. Found worldwide in sedimentary and volcanic rock formations.
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