mineral

Tumbled jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

AI-generated identification · may be incorrect

Opaque, polished reddish-brown and cream stone with waxy-to-dull luster; Mohs hardness 6.5–7, no visible cleavage, conchoidal fracture, and microcrystalline quartz structure. The mottled pattern is typical of jasper, though exact variety cannot be confirmed from the image alone.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities or replaces volcanic and sedimentary material, with iron producing red-brown coloration. Deposits occur from Precambrian to recent ages; this specimen has been cut or tumbled and polished.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary pieces; occasionally as decorative aggregate. Common tumbled specimens generally have modest market value.

Geological facts

Jasper is a variety of opaque chalcedony rather than a single mineral species, and its colors reflect impurities and alteration history. Similar material may be sold as red jasper, picture jasper, or brecciated jasper.

Field identification & locations

Identify it by opacity, earthy iron-rich colors, smooth polish, and quartz-like hardness; it should scratch glass but resist a steel knife. Common sources include India, Madagascar, Brazil, the United States, and Australia.