mineral

Tumbled red jasper (likely)

Jasper, opaque microcrystalline quartz (SiO₂), colored mainly by iron oxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brick-red to pink, waxy to dull luster, cryptocrystalline quartz with no visible cleavage; specific gravity about 2.5–2.7. The rounded, polished form indicates tumbling.

Identified September 7, 2026More mineral →

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Physical properties

Formation & geological history

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

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and ornamental objects; durable but generally inexpensive.

Geological facts

Jasper is a variety of chert distinguished by its opacity and abundant impurities. Similar red stones may include dyed quartzite, carnelian, or red aventurine.

Field identification & locations

Identify it by its opaque red body, fine grain, glassy/waxy polish, and lack of cleavage; it should not scratch easily with a steel knife. The photograph alone cannot confirm natural jasper versus dyed material.