mineral

Polished banded jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide and clay-mineral bands

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, gold, black, and cream swirls; vitreous to waxy luster; cryptocrystalline quartz with no visible cleavage and conchoidal fracture. The specimen appears tumbled or polished.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or brecciated rock, with iron oxides producing the contrasting colors. Its exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used for cabochons, carvings, lapidary ornaments, paperweights, and decorative stone; attractive patterned pieces have modest collector value.

Geological facts

The flowing bands may resemble wood grain or landscape imagery, a common reason jasper varieties are collected. Jasper is an aggregate rather than a single well-formed crystal.

Field identification & locations

Identify it by its opaque appearance, strong swirling bands, glassy/waxy polish, and resistance to scratching by ordinary steel. Common sources include Oregon, Idaho, Utah, Arizona, Madagascar, Australia, and South Africa.