mineral

Tumbled jasper, likely brecciated or orbicular jasper

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown to reddish-brown, waxy to dull luster, cryptocrystalline structure, and no visible cleavage. The pits and contrasting cream-colored patches may be natural cavities or breccia fragments.

Identified September 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills fractures, cavities, or volcanic sediments, later cementing and staining them with iron oxides. Precise age and locality cannot be determined from the image alone; jasper occurs in many ancient volcanic and sedimentary terrains.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, and polished specimens; occasionally used for small decorative objects and jewelry.

Geological facts

Jasper is a variety of opaque chalcedony distinguished by abundant impurities, especially iron oxides that produce red, yellow, and brown colors. This specimen appears tumbled and polished rather than naturally weathered.

Field identification & locations

Identify by its opaque appearance, very fine texture, waxy polish, and resistance to scratching; it should scratch glass but not be scratched by a steel knife. Common sources include India, Madagascar, Brazil, the United States, and Australia.