mineral

Polished red jasper (likely brecciated jasper)

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

AI-generated identification · may be incorrect

Opaque, dark red to brown with black areas, glassy-to-waxy luster, and a fine cryptocrystalline quartz structure; hardness about 6.5–7 Mohs, no visible cleavage, specific gravity roughly 2.5–2.7.

Identified August 14, 2026More mineral →

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Physical properties

Opaque, dark red to brown with black areas, glassy-to-waxy luster, and a fine cryptocrystalline quartz structure; hardness about 6.5–7 Mohs, no visible cleavage, specific gravity roughly 2.5–2.7.

Formation & geological history

Forms when silica-rich fluids cement fine sediment, volcanic ash, or breccia, with iron oxides producing the red coloration. It is generally ancient, commonly associated with volcanic or hydrothermal environments, though an exact age cannot be determined from the image.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and tumbling; occasionally used as decorative stone. Common polished pieces usually have modest value.

Geological facts

The black portions may be manganese oxides, magnetite, or darker host material; the red areas are typically hematite or related iron oxides. Its smooth rounded shape indicates tumbling or natural water-wear, and the strong polish is human-applied.

Field identification & locations

Commonly found in volcanic and sedimentary terrains worldwide, including India, Madagascar, Brazil, Australia, and the western United States. Identify it by its opacity, red iron-rich coloration, fine texture, and lack of distinct crystals; it will not fizz in dilute acid.