mineral

Tumbled jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

AI-generated identification · may be incorrect

Opaque, mottled reddish-brown, rust, and dark gray with a polished, waxy-to-glassy luster; quartz hardness is about 6.5–7 Mohs, with no visible cleavage. The rounded shape and smooth surface indicate tumbling or polishing; exact identification cannot be confirmed from the image alone.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill cavities or replace material in rocks, with iron oxides producing red and brown colors; brecciated varieties contain cemented angular fragments. Formation age and locality are not determinable from the image.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and lapidary collections.

Geological facts

Jasper is an opaque variety of chalcedony; its patterns and colors vary widely with mineral impurities and included fragments.

Field identification & locations

Look for opacity, fine-grained texture, iron-rich colors, and a smooth polish; jasper occurs worldwide in silica-rich volcanic and sedimentary settings. A small common tumbled piece typically sells for about $2–$15 USD.