mineral

Polished iron-rich jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; opaque, with a smooth polish and earthy red, brown, and yellow patches. Quartz has a trigonal crystal structure; individual grains are too fine to see, and the specimen shows no obvious cleavage.

Identified September 28, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids fill cavities or replace sediment, with iron oxides creating the colors; jasper deposits occur in rocks of many geological ages.

Uses & applications

Used for cabochons, jewelry, carvings, and decorative objects; polished pieces are also collected.

Geological facts

Jasper’s colors and patterns vary widely, and trade names often describe appearance or locality rather than a distinct mineral species.

Field identification & locations

The opaque, fine-grained texture and iron-stained patterns are consistent with jasper, though a photo cannot confirm exact variety. Jasper occurs worldwide, including India, Madagascar, Brazil, and the United States.