mineral

Tumbled purple jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact identification is uncertain from the photo

AI-generated identification · may be incorrect

Rounded, polished, opaque purple-brown surface with mottled patches. Quartz has Mohs hardness 7, vitreous to waxy luster, and a trigonal crystal structure too fine-grained to see; no distinct cleavage.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids fill or replace rock, with iron and other impurities producing color. It occurs in many geological ages and settings; the specimen’s specific source cannot be determined visually.

Uses & applications

Used for beads, cabochons, ornaments, and lapidary collectibles; typically not a major construction material.

Geological facts

Jasper is defined by its opacity and fine-grained quartz texture; similar-looking purple stones can include other silica-rich materials.

Field identification & locations

Look for an opaque, dense stone that resists scratching with a steel blade; confirmatory testing may distinguish jasper from softer lookalikes. Jasper occurs worldwide, including India, Australia, Brazil, and the western United States.