mineral
Jasper
SiO2 (Silicon Dioxide)
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Orange, brown, yellow. Luster: Waxy to dull. Crystal structure: Microcrystalline quartz. Cleavage: None. Specific gravity: 2.5-2.9
- Hardness
- 6
- Color
- Orange, brown, yellow
- Luster
- Waxy to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Orange, brown, yellow. Luster: Waxy to dull. Crystal structure: Microcrystalline quartz. Cleavage: None. Specific gravity: 2.5-2.9
Formation & geological history
Formed from silica-rich fluids that seep into cracks and cavities in rocks, eventually crystallizing into chalcedony. The vibrant colors come from mineral impurities like iron oxides.
Uses & applications
Often used as a gemstone in jewelry, for decorative carving, and as a tumbling stone for collectors.
Geological facts
Jasper is a variety of chalcedony, an opaque form of microcrystalline quartz. The name means 'spotted or speckled stone' in Old French.
Field identification & locations
Identified by its opacity, hardness, and conchoidal fracture. Often found in riverbeds or as loose stones.
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