mineral

Polished red jasper (likely hematite-bearing jasper)

Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides such as hematite/goethite

AI-generated identification · may be incorrect

Opaque brick-red to brown, black iron-oxide patches, vitreous to waxy luster, cryptocrystalline quartz, no visible cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.5–2.7. The rounded, glossy surface indicates tumbling or polishing.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement volcanic, sedimentary, or hydrothermal material, with iron oxidation producing the red color. Deposits range from Precambrian to younger volcanic and sedimentary settings.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and lapidary specimens; occasionally decorative aggregate. It is generally an inexpensive gemstone material.

Geological facts

Jasper is a variety of opaque chalcedony and can show brecciated, orbicular, or flow patterns. The dark areas may be hematite or magnetite, but visual identification alone cannot confirm the exact iron mineral.

Field identification & locations

Identify by its opacity, red iron staining, fine-grained texture, and resistance to scratching; it should not fizz in dilute acid. Common sources include India, Madagascar, Brazil, Australia, and the western United States.