mineral

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque reddish-orange, black/gray veining, waxy to vitreous luster, and no visible crystals; Mohs hardness about 6.5–7, conchoidal fracture, and specific gravity near 2.6. The rounded shape indicates mechanical tumbling and polishing.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement sediment, commonly incorporating hematite or other iron oxides that create the red color; it occurs in many ages and host-rock environments. Common sources include India, Brazil, Madagascar, South Africa, and the western United States.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, ornamental objects, and lapidary work; it has little industrial value compared with ordinary quartz.

Geological facts

The specimen appears to be brecciated or banded jasper, with darker mineral-rich seams. Red coloration generally reflects hematite or goethite impurities rather than the quartz itself.

Field identification & locations

Identify it by its opaque red body, dark irregular patterning, glassy/waxy polish, and resistance to scratching; it should scratch window glass but not be scratched by a steel knife. A definitive identification may require hardness and streak testing.