mineral

Jasper

Chalcedony (SiO2)

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.

Hardness: 6
Color: Greenish-grey with dark mottling/inclusions
Luster: Vitreous to dull

Identified June 17, 2026More mineral →

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Physical properties

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.