metamorphic

Tumbled jasper

Microcrystalline quartz (SiO₂), commonly with hematite/goethite and other iron oxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque salmon-red, brown, black, and cream coloration; dull to waxy luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture. The smooth edges indicate tumbling or natural abrasion.

Identified September 8, 2026More metamorphic →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic or sedimentary material, with iron oxides producing the red-brown colors; specimens may range from Paleozoic to modern host-rock ages. Common sources include volcanic terrains and silica-rich sedimentary deposits.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and lapidary tumbling; occasionally used as decorative stone. Typical value is modest unless unusually patterned or from a sought-after locality.

Geological facts

The dark bands and salmon patches suggest iron-rich jasper, possibly brecciated or orbicular material, but the small image does not support a precise varietal name.

Field identification & locations

Identify it by its opaque multicolor pattern, quartz-like hardness, lack of cleavage, and resistance to scratching by a steel blade; a streak test is usually white to faintly colored. Common localities include India, Madagascar, Brazil, Australia, and the western United States.