mineral
Jasper
Chalcedony (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Greenish-grey with dark mottling/inclusions. Luster: Vitreous to dull. Crystal structure: Microcrystalline (trigonal). Cleavage: None. Specific gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Greenish-grey with dark mottling/inclusions
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Greenish-grey with dark mottling/inclusions. Luster: Vitreous to dull. Crystal structure: Microcrystalline (trigonal). Cleavage: None. Specific gravity: 2.58-2.91.
Formation & geological history
Formed from silica-rich fluids that seep into cavities and fractures in rocks, often with impurities like iron oxides creating the patterns. Age varies widely.
Uses & applications
Commonly used in lapidary arts, jewelry making (cabochons, beads, pendants), and as a decorative stone.
Geological facts
Jasper is an opaque variety of chalcedony. The name means 'spotted or speckled stone'. Different patterns and colors lead to many trade names, such as 'Ocean Jasper' or 'Kambaba Jasper', though this specific green patterned piece resembles Kambaba or crocodile jasper.
Field identification & locations
Identified by its opacity, hardness (scratches glass), and characteristic patterns. Commonly found worldwide. Collectors look for unique patterns and colors.
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