sedimentary
Jasper
SiO2
AI-generated identification · may be incorrectHardness: 6.5-7. Color: Red, brown, yellow, green. Luster: Vitreous to dull. Crystal structure: Microcrystalline quartz. Cleavage: None. Specific gravity: 2.5-2.9.
- Hardness
- 6
- Color
- Red, brown, yellow, green
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7. Color: Red, brown, yellow, green. Luster: Vitreous to dull. Crystal structure: Microcrystalline quartz. Cleavage: None. Specific gravity: 2.5-2.9.
Formation & geological history
Formed from silica-rich fluids that percolate through rocks and deposit silica in cracks and cavities. Can form in sedimentary or volcanic environments.
Uses & applications
Used in jewelry, carvings, and as an ornamental stone. historically used for tools and weapons.
Geological facts
Jasper is an opaque, impure variety of silica. The red color is due to iron inclusions.
Field identification & locations
Identify by its hardness (scratches glass), opacity, and conchoidal fracture. Often found as water-worn pebbles in streams or beaches.
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Sandstone or Siltstone
Arenite (if sandstone)
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Shale
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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