mineral
Jasper
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: brown, red, green, or yellow due to impurities (iron oxides). Luster: dull to vitreous. Crystal structure: microcrystalline quartz.
- Hardness
- 6
- Color
- brown, red, green, or yellow due to impurities (iron oxides)
- Luster
- dull to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: brown, red, green, or yellow due to impurities (iron oxides). Luster: dull to vitreous. Crystal structure: microcrystalline quartz.
Formation & geological history
Formed from silica-rich fluids in sedimentary or volcanic environments, often replacing other minerals or organic material over millions of years.
Uses & applications
Commonly used in lapidary arts, jewelry, and ornamental carving.
Geological facts
Jasper is an opaque variety of chalcedony. The name means 'spotted or speckled stone' in Old French.
Field identification & locations
Identified by its opacity, hardness (scratches glass), and characteristic colors. Common worldwide, often found as river cobbles or beach stones.
