Mineral
Jasper
Silicon dioxide, SiO2
AI-generated identification · may be incorrectHardness: 6.5-7 on the Mohs scale. Color: Highly variable, often red, yellow, brown, or green due to impurities. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline (microcrystalline quartz). 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 the Mohs scale. Color: Highly variable, often red, yellow, brown, or green due to impurities. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline (microcrystalline quartz). Cleavage: None. Specific gravity: 2.5-2.9.
Formation & geological history
Formed through the deposition of silica-rich fluids in cracks or cavities, often associated with volcanic or sedimentary environments. Can be of various geological ages.
Uses & applications
Often used in lapidary arts for cabochons, carvings, and beads due to its hardness and varied patterns. Also collected by rock enthusiasts.
Geological facts
Jasper has been used since antiquity for ornaments and seals. The name derives from the Greek word 'iaspis', meaning 'spotted stone'.
Field identification & locations
Identifiable by its opaque nature, Mohs hardness of 6.5-7 (will scratch glass), and wide variety of colors and patterns. Found worldwide, often in areas with volcanic activity or secondary silica deposition.
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