mineral

Tumbled red jasper

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

AI-generated identification · may be incorrect

Typically Mohs 6.5–7; red to brick-red, opaque, with earthy to vitreous luster and no visible cleavage. The rounded, glossy surfaces indicate mechanical tumbling and polishing.

Identified August 20, 2026More mineral →

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Physical properties

Typically Mohs 6.5–7; red to brick-red, opaque, with earthy to vitreous luster and no visible cleavage. The rounded, glossy surfaces indicate mechanical tumbling and polishing.

Formation & geological history

Forms when silica-rich fluids replace or cement volcanic or sedimentary material, with iron producing the red color; deposits range from Precambrian to younger ages. Common sources include Brazil, India, Madagascar, Uruguay, and the western United States.

Uses & applications

Used for lapidary cabochons, beads, carvings, decorative objects, and inexpensive jewelry; polished pieces are also sold as collecting specimens.

Geological facts

Jasper is a variety of chalcedony/microcrystalline quartz, though its dense, opaque texture distinguishes it from translucent agate. Surface variation and occasional dark veins reflect changing iron and silica content during formation.

Field identification & locations

Identify it by its opaque red color, fine texture, lack of cleavage, and quartz hardness; it should scratch glass but not be scratched by a steel knife. The surrounding material appears to be granite, while the pictured rounded specimens are polished pebbles.