Mineral/Sedimentary
Jasper (Green)
Silicon dioxide (SiO2)
Hardness: 6.5-7 on the Mohs scale. Color: Green, often opaque. Luster: Vitreous, dull. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Green, often opaque
- Luster
- Vitreous, dull
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: Green, often opaque. Luster: Vitreous, dull. Crystal structure: Cryptocrystalline. Cleavage: None. Specific gravity: 2.58-2.91.
Formation & geological history
Formed in sedimentary and metamorphic environments, typically from silica-rich fluids that precipitate or replace existing materials. The green color is often due to iron silicate impurities, such as chlorite.
Uses & applications
Commonly used in lapidary arts, jewelry, and as a decorative stone. Historically used for talismans and amulets.
Geological facts
Jasper is an opaque variety of chalcedony. It comes in many colors and patterns, and has been used by various cultures throughout history.
Field identification & locations
Identify by its hardness, opacity, and conchoidal fracture. Often found as water-worn pebbles in riverbeds or beaches. A common but popular stone for beginners.
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