mineral

Tumbled jasper

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

AI-generated identification · may be incorrect

Opaque, mottled ochre-brown and yellow with a smooth, rounded, polished surface. Quartz has Mohs hardness 7, vitreous to dull luster, and a trigonal crystal structure; the fine-grained stone shows no visible cleavage. Specific gravity is about 2.6.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms as silica-rich fluids fill cavities or replace sediment, with iron and other impurities producing its colors. Deposits formed across many geological ages and occur in volcanic and sedimentary settings.

Uses & applications

Used for beads, cabochons, ornamental objects, and lapidary collections; not typically used as structural stone.

Geological facts

Jasper is a broad trade and geological term for opaque, patterned chalcedony and related microcrystalline quartz.

Field identification & locations

Look for hardness, opacity, and earthy patterns; similar-looking stones may include other chalcedony or iron-stained quartz. Found worldwide, including India, Brazil, Australia, and the western United States.