mineral

Polished red jasper

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

AI-generated identification · may be incorrect

Opaque reddish-brown and gray-green, with earthy to dull vitreous luster and irregular swirled banding; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and specific gravity near 2.6. The rounded, glossy form indicates a tumbled or polished specimen.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich groundwater replaces or cements volcanic ash, sediments, or fractured rock, while iron produces the red coloration; its exact geological age depends on locality. The image may show brecciated or orbicular jasper rather than a single uniform variety.

Uses & applications

Used for cabochons, beads, carvings, palm stones, and decorative objects; durable jasper is also used in small architectural ornaments. Common material has modest collector value.

Geological facts

Jasper is a cryptocrystalline variety of quartz whose individual crystals are generally invisible without magnification. Gray-green zones may reflect chlorite or other altered volcanic minerals, while red areas typically contain hematite or related iron oxides.

Field identification & locations

Identify it by its opacity, waxy/earthy polish, hardness, and red iron-stained patterns; it should resist scratching by a steel knife but scratch glass. Common sources include India, Madagascar, Brazil, Australia, Mexico, and the western United States.