mineral

Tumbled jasper (likely brecciated or red jasper)

Jasper, microcrystalline quartz/chalcedony (SiO₂), colored by iron oxides

AI-generated identification · may be incorrect

Opaque reddish-brown, white veining, earthy to dull luster, fine-grained cryptocrystalline structure, no visible cleavage; Mohs hardness about 6.5–7 and specific gravity around 2.6.

Identified August 25, 2026More mineral →

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Physical properties

Opaque reddish-brown, white veining, earthy to dull luster, fine-grained cryptocrystalline structure, no visible cleavage; Mohs hardness about 6.5–7 and specific gravity around 2.6.

Formation & geological history

Forms when silica-rich fluids cement and replace sediments or volcanic material, with iron producing the red-brown color; deposits range from Precambrian to much younger ages. The rounded edges indicate tumbling or natural abrasion.

Uses & applications

Used for cabochons, beads, carvings, decorative stone, and inexpensive collector specimens; occasionally used as aggregate or ornamental building stone.

Geological facts

Jasper is technically a quartz-rich variety of chert distinguished by opacity and impurities. White areas may be quartz/chalcedony vein material or breccia cement.

Field identification & locations

Identify it by its opaque red-brown body, hardness, lack of cleavage, and resistance to scratching by a steel knife; quartz should not scratch it. Common sources include Brazil, India, Madagascar, the United States, Mexico, and Australia.