mineral

Tumbled jasper (likely red/brown jasper)

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

AI-generated identification · may be incorrect

Opaque reddish-brown with a polished, vitreous-to-waxy luster; quartz hardness about 6.5–7 Mohs, trigonal crystal structure, and no cleavage. The image alone cannot confirm the exact variety or composition.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms as silica-rich material that becomes microcrystalline quartz, often incorporating iron-rich impurities; deposits occur in many ages and geological settings, including volcanic and sedimentary rocks.

Uses & applications

Commonly cut and polished for jewelry, beads, and decorative objects; also collected as an inexpensive lapidary stone.

Geological facts

Jasper’s colors and patterns arise from mineral impurities and inclusions; the name covers many visually distinct varieties.

Field identification & locations

A dense, opaque stone with mottled color and no visible individual crystals is consistent with jasper; it is found worldwide, including India, Brazil, Australia, and the United States. A hardness test or examination of a broken surface would help distinguish it from other tumbled stones.