mineral

Polished brown jasper (brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and dark mineral inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, ochre, black, and cream coloration; waxy to vitreous luster when polished; cryptocrystalline quartz with irregular white veining and no visible cleavage. Specific gravity is approximately 2.55–2.70.

Identified September 12, 2026More mineral →

Explore Polished brown jasper (brecciated jasper) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich fluids cement and replace sedimentary or volcanic material, with iron oxides producing the brown-orange colors; brecciation accounts for the contrasting vein networks. Most jasper is Phanerozoic, though its exact age cannot be determined from an image.

Uses & applications

Used for cabochons, beads, carvings, decorative polished stones, and lapidary objects; it is generally ornamental rather than industrial.

Geological facts

The specimen appears tumbled or highly polished, and its dark angular zones may indicate brecciation or dendritic manganese/iron-oxide patterns. Jasper is a variety of opaque chalcedony rather than a single mineral species.

Field identification & locations

Identify by its opacity, very fine grain, hardness, waxy polish, and lack of cleavage; common sources include India, Madagascar, Brazil, Australia, Mexico, and the western United States. A glassy appearance or bubbles would suggest imitation glass instead.