mineral

Polished jasper cabochon

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

AI-generated identification · may be incorrect

Opaque orange-brown to reddish body with mottling and a polished vitreous-to-waxy luster; quartz crystal structure is microscopic, with no visible cleavage. Mohs hardness is about 6.5–7; specific gravity approximately 2.5–2.9.

Identified September 9, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich groundwater replaces or cements sediment and volcanic material, with iron oxides producing the warm colors. Deposits range from Precambrian to much younger volcanic and sedimentary settings.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and small collectible specimens; occasionally used as decorative stone. This is a low-cost jewelry material.

Geological facts

The specimen appears shaped and polished rather than naturally exposed, so its exact jasper variety cannot be determined confidently from the image alone.

Field identification & locations

Identify jasper by its opacity, fine-grained texture, hardness, and red/orange iron staining; it does not show the translucency or banding typical of agate. Common sources include India, Madagascar, Brazil, Australia, Mexico, and the western United States.