mineral

Tumbled jasper (likely brecciated or ocean jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque, rounded and polished, with reddish-brown, cream, gray, and black patches; vitreous to waxy luster and no visible cleavage. Hardness is about 6.5–7 Mohs; specific gravity approximately 2.6.

Identified August 19, 2026More mineral →

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Physical properties

Opaque, rounded and polished, with reddish-brown, cream, gray, and black patches; vitreous to waxy luster and no visible cleavage. Hardness is about 6.5–7 Mohs; specific gravity approximately 2.6.

Formation & geological history

Formed when silica-rich fluids cemented or replaced volcanic or sedimentary material, with iron oxides producing the red-brown colors; its exact geological age and locality cannot be determined from the image.

Uses & applications

Used as a lapidary and jewelry stone, in cabochons, beads, carvings, and decorative objects; common tumbled pieces have modest value.

Geological facts

The pattern may indicate brecciated jasper, while orbicular patterns would support ocean jasper; image quality prevents a precise variety identification.

Field identification & locations

Identify jasper by its opacity, fine grain, hardness, and resistance to scratching by a steel knife, unlike softer dyed materials. Common sources include Madagascar, Brazil, India, Australia, and the western United States.