mineral

Red-and-gray banded jasper

Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Opaque, fine-grained chalcedony with red-orange and gray banding; dull to slightly waxy luster, no visible crystals, conchoidal fracture, and Mohs hardness about 6.5–7. Specific gravity is typically 2.5–2.7; the rounded shape appears tumbled or naturally water-worn.

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 breccia, with iron oxides producing the red coloration. Its age depends on the deposit; similar material occurs from Precambrian through younger volcanic and sedimentary terrains.

Uses & applications

Used as an ornamental stone, cabochon, bead, carving material, and lapidary specimen; occasionally used for decorative tiles and small objets d’art.

Geological facts

The red color commonly comes from hematite or other ferric iron minerals. “Jasper” is a broad lapidary term rather than a single precisely defined mineral species.

Field identification & locations

Identify it by its opacity, red iron-rich bands, fine texture, and ability to scratch ordinary glass; it will not show the granular crystals of granite. Common sources include India, Madagascar, Brazil, Australia, and the western United States.