mineral

Polished brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with angular fragments cemented by silica or iron oxides

AI-generated identification · may be incorrect

Mostly white to cream with rusty-brown and dark veins; opaque, waxy to dull luster, hardness about 6.5–7 Mohs, and no visible cleavage. The rounded shape and smooth surface indicate polishing.

Identified October 3, 2026More mineral →

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Physical properties

Mostly white to cream with rusty-brown and dark veins; opaque, waxy to dull luster, hardness about 6.5–7 Mohs, and no visible cleavage. The rounded shape and smooth surface indicate polishing.

Formation & geological history

Forms when silica-rich fluids fill and cement fractures or sedimentary fragments; iron oxides produce the brown staining. Jasper deposits occur in many geological periods, so age cannot be determined from the image.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; generally valued as an ornamental stone rather than an industrial material.

Geological facts

Jasper is a quartz-rich chalcedony, and its varied patterns arise from mineral impurities and fragment cementation.

Field identification & locations

The opaque appearance, quartz-like hardness, and contrasting brecciated pattern support identification; confirm with a hardness test, since appearance alone is not definitive. Jasper occurs worldwide, including in the western United States, Australia, and India.