sedimentary
Jasper (Cream/Yellow variety)
Jasper (Microcrystalline Quartz, SiO2)
Hardness: 6.5-7 (Mohs scale), Color: Creamy white with tan/yellow iron staining, Luster: Waxy to dull, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Creamy white with tan/yellow iron staining, Luster: Waxy to dull, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.58-2.91
Formation & geological history
Formed from silica-rich fluids precipitating in sedimentary or volcanic environments, typically as nodules or fill in fissures. The yellowish tint is due to trace amounts of iron oxides (limonite).
Uses & applications
Commonly used for lapidary work (cabochons), jewelry, decorative tumbled stones, and as an ornamental architectural material.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. In ancient times, it was believed to provide protection and balance energy.
Field identification & locations
Identify by its waxy luster, smoothness when tumbled, and the fact that it cannot be scratched by a steel knife. Common in river beds, beaches, and desert washes globally. To identify in the field, look for a smooth, opaque stone that breaks with curved surfaces.
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