mineral

Jasper

Silicon dioxide (SiO2) with impurities

AI-generated identification · may be incorrect

Hardness 6.5-7 on Mohs scale. Opaque, massive, fine-grained variety of chalcedony. Colors vary widely but often red, yellow, brown, or green due to iron inclusions. Waxy to dull luster. No cleavage. Specific gravity 2.5-2.9.

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. The red color in this specimen is typically due to iron oxide (hematite) inclusions.

Uses & applications

Used historically and currently for carving, jewelry (cabochons, beads), tumbling, and ornamental objects.

Geological facts

Jasper has been used for millennia for tools, seals, and adornment. The name means 'spotted or speckled stone'.

Field identification & locations

Identified by its opacity, hardness (can scratch glass), and conchoidal fracture. Often found as river rocks or in gravel deposits, tumbling naturally into smooth shapes like the one shown.