mineral

Polished jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque, with a vitreous-to-waxy luster and orange-brown, cream, and reddish swirled patterns. The rounded, glossy surface indicates a tumbled and polished specimen; crystal grains are microscopic and cleavage is absent.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediment, or altered rock, with iron oxides producing the warm colors. Deposits are geologically varied and commonly Paleozoic to Cenozoic, depending on locality.

Uses & applications

Used for beads, cabochons, carvings, tumbling, ornamental objects, and lapidary practice; it has little structural or industrial use compared with ordinary quartz.

Geological facts

The pattern may resemble scenic or picture jasper, but exact variety and locality cannot be confirmed from the photograph alone.

Field identification & locations

Identify it by its opacity, colorful fine-grained patterns, glassy polish, lack of cleavage, and resistance to scratching by a steel knife; glassy look-alikes may show bubbles or be softer. Common sources include India, Madagascar, Brazil, Australia, Mexico, and the western United States.