mineral

Tumbled jasper (likely brecciated or polychrome jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities

AI-generated identification · may be incorrect

Opaque reddish-brown and orange material with lighter cream veining, waxy to slightly glossy luster, and no visible crystal faces; hardness about 6.5–7 Mohs, conchoidal fracture, and specific gravity around 2.6. The rounded shape indicates natural water wear or tumbling/polishing.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich groundwater replaces or cements volcanic ash, sediments, or breccia, commonly with iron oxides producing red and brown colors. Formation ages vary widely, from Precambrian to younger volcanic and sedimentary settings.

Uses & applications

Used for cabochons, beads, carvings, lapidary pieces, and ornamental objects; rarely used as aggregate or decorative stone. Small tumbled specimens have modest collecting value.

Geological facts

Its color comes mainly from hematite and related iron oxides, while translucent edges may contain chalcedony. The greenish-gray streak could represent a mineral inclusion or surface alteration.

Field identification & locations

Identify it by its opaque earthy colors, fine-grained texture, strong hardness, lack of cleavage, and inability to scratch with a steel blade easily; quartz will scratch glass. Common sources include India, Madagascar, Brazil, Australia, and the western United States.