mineral

Tumbled brecciated jasper

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque reddish-brown, gray, and cream coloration with a dull-to-waxy polished luster. It is cryptocrystalline quartz with no visible cleavage and typically conchoidal fracture; apparent cavities and contrasting patches suggest brecciation or weathering.

Identified September 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids cemented or replaced fragments of older volcanic or sedimentary rock, with iron oxides producing the red-brown colors. Jasper deposits range from Precambrian to relatively young; this specimen is tumbled and polished, so its exact age and locality cannot be determined visually.

Uses & applications

Used as an ornamental stone, cabochon material, beads, carvings, and inexpensive jewelry; occasionally used for decorative countertops and lapidary work.

Geological facts

Jasper is a variety of opaque chalcedony or microcrystalline quartz, and “brecciated” describes angular fragments cemented together. The porous-looking areas may be natural vugs or softer inclusions exposed during tumbling.

Field identification & locations

Identify it by its opaque fine-grained texture, silica-like hardness, earthy red-brown patterning, and inability to scratch with a steel knife easily; glass should be scratchable only with difficulty. Common sources include India, Madagascar, Brazil, the United States, and Australia.