mineral

Tumbled red-brown stone, likely jasper

Jasper, microcrystalline quartz (SiO₂), probably iron-oxide-bearing chert

AI-generated identification · may be incorrect

Typically Mohs hardness 6.5–7, opaque red-brown color, dull to waxy luster, and no visible cleavage; its color comes mainly from hematite or goethite inclusions. The rounded, glossy surface indicates tumbling or polishing.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids replace or cement sediment, commonly in volcanic or sedimentary environments; iron oxides produce the red-brown coloration. Formation ages vary from Precambrian to recent, depending on locality.

Uses & applications

Used for beads, cabochons, carvings, decorative objects, and small polished specimens; industrial use is limited because it is generally ornamental rather than gem-grade.

Geological facts

Jasper is a variety of opaque chalcedony or microcrystalline quartz and may display brecciation, banding, or orbicular patterns. The image does not show enough detail for a precise variety or locality identification.

Field identification & locations

Identify by its opaque reddish color, glassy/waxy polish, absence of cleavage, and resistance to scratching; quartz or steel should not easily scratch it. Common sources include India, Madagascar, Brazil, Australia, and the western United States.