sedimentary
Jasper
Microcrystalline Quartz (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Varies widely including red, brown, yellow, green, and patterned; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); 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; Color: Varies widely including red, brown, yellow, green, and patterned; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich solutions in sedimentary or volcanic environments, often through the replacement of organic material or deposition in marine sediments over millions of years.
Uses & applications
Used for ornamental objects, cabochons in jewelry, carving, and as a collector specimen.
Geological facts
Jasper has been used since ancient times for seals, signet rings, and talismans, valued for its rich colors and durability.
Field identification & locations
Can be identified by its conchoidal fracture, waxy to dull luster, and high hardness which scratches glass. Found worldwide in various geological formations.
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