mineral

Tumbled brown jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and clay inclusions

AI-generated identification · may be incorrect

Opaque brown-gold, earthy to waxy luster, massive microcrystalline structure, no visible cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.6.

Identified September 14, 2026More mineral →

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Physical properties

Opaque brown-gold, earthy to waxy luster, massive microcrystalline structure, no visible cleavage; Mohs hardness about 6.5–7, specific gravity roughly 2.6.

Formation & geological history

Forms when silica-rich fluids fill cavities or replace volcanic and sedimentary materials; iron oxides create the brown coloration. Most jasper is Phanerozoic or Precambrian, depending on its deposit.

Uses & applications

Used as ornamental stone, cabochons, beads, carvings, polished stones, and lapidary material; generally decorative rather than industrial.

Geological facts

Jasper is a variety of opaque chalcedony and may contain hematite, goethite, clay, or other minerals. Its patterns and colors result mainly from impurities and replacement textures.

Field identification & locations

Identify by its opaque appearance, hardness, fine grain, and inability to scratch easily with a steel knife; it lacks the glassy translucence typical of agate. Common sources include India, Madagascar, Brazil, Australia, and the western United States.