metamorphic

Polished picture jasper (likely)

Microcrystalline quartz (SiO₂), colored by iron oxides and other mineral impurities

AI-generated identification · may be incorrect

Opaque, mottled tan, cream, brown, and black with a polished luster; quartz hardness is about 6.5–7 Mohs, and its crystals are too fine to see. The photo does not show diagnostic features clearly enough to confirm the exact jasper variety.

Identified October 13, 2026More metamorphic →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill cavities or replace sediment, with iron and other impurities producing patterns; it is commonly Precambrian to younger. The specimen appears shaped and polished from natural stone.

Uses & applications

Used for cabochons, beads, ornaments, and lapidary collections; it has little common industrial or construction use.

Geological facts

Jasper is an ornamental variety of chalcedony, a microcrystalline form of quartz; its patterns are mineral staining and inclusions rather than visible crystals.

Field identification & locations

Look for an opaque, silica-hard stone with a smooth polish and irregular earthy patterns; jasper occurs worldwide, including India, Madagascar, Australia, and the western United States. A scratch test against glass can help distinguish it from softer rocks, but avoid damaging a polished piece.