mineral
Jasper (or possibly Agate/Chalcedony) beads
SiO2 (Silicon Dioxide)
Hardness: 6.5-7 on Mohs scale. Color: Dark green to blackish with mottling. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Dark green to blackish with mottling
- Luster
- Vitreous to dull
Identified More mineral →
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Dark green to blackish with mottling. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.91.
Formation & geological history
Formed in hydrothermal veins, volcanic rocks, or sedimentary deposits as secondary silica precipitation.
Uses & applications
Commonly used in jewelry making, specifically for beaded bracelets and necklaces.
Geological facts
Jasper is an opaque, impure variety of silica, usually red, yellow, brown or green in color.
Field identification & locations
Identified by its hardness (scratches glass), opacity, and lack of cleavage. Common worldwide.
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