mineral
Jasper
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7. Color: Reddish-brown, orange, yellow. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.5-2.9.
- Hardness
- 6
- Color
- Reddish-brown, orange, yellow
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7. Color: Reddish-brown, orange, yellow. Luster: Vitreous to dull. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.5-2.9.
Formation & geological history
Formed by silica-rich fluids permeating volcanic rocks or sedimentary deposits. Often found in riverbeds or beaches where it has been naturally tumbled.
Uses & applications
Used in lapidary arts, jewelry making, and as a decorative stone. Also popular among collectors for tumbling and polishing.
Geological facts
Jasper is an opaque variety of chalcedony. The reddish-brown color is typically due to iron oxide impurities.
Field identification & locations
Identify by its opacity, hardness (can scratch glass), and conchoidal fracture. Often found as water-worn pebbles in streams or on beaches.
