mineral
Jasper
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Highly variable, often red, yellow, brown, or green due to iron inclusions. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.5-2.9.
- Hardness
- 6
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Highly variable, often red, yellow, brown, or green due to iron inclusions. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.5-2.9.
Formation & geological history
Forms from the deposition of silica-rich waters in sedimentary or volcanic environments. Often replaces other materials like wood or forms in nodules.
Uses & applications
Commonly used as a gemstone in jewelry, for ornamental carvings, and in lapidary arts.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'jasper' means 'spotted or speckled stone'.
Field identification & locations
Identified by its opacity, hardness, and often striking patterns or colors. Commonly found worldwide, with notable deposits in the US, Russia, India, and Madagascar.
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