mineral

Jasper

SiO2

AI-generated identification · may be incorrect

Hardness 6.5-7 on Mohs scale. Opaque variety of chalcedony. Often red, yellow, brown, or green in color due to mineral impurities (like iron oxides). Luster is vitreous to greasy. Microcrystalline quartz structure.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, volcanic rocks, and sedimentary deposits as silica-rich fluids precipitate and replace other materials over time.

Uses & applications

Used primarily as a gemstone, in lapidary arts, and for ornamental carvings. Often tumbled or polished for jewelry and collecting.

Geological facts

The name means 'spotted or speckled stone'. Jasper was a favorite gem in ancient times, used for seals, amulets, and decorative items.

Field identification & locations

Identify by its hardness (scratches glass), opacity (unlike agate which is often translucent), and varied, earthy colors. Common globally in volcanic and sedimentary environments.