sedimentary

Red jasper pebble

Microcrystalline quartz (SiO₂), colored chiefly by iron oxides

AI-generated identification · may be incorrect

Opaque reddish-brown, fine-grained, and typically with a dull to mildly waxy luster; hardness about 6.5–7 Mohs, no cleavage, conchoidal fracture, and specific gravity near 2.6. The rounded shape indicates natural water wear or tumbling/polishing.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement fine sediments, often incorporating hematite or goethite that produces the red color. It occurs in ancient volcanic-sedimentary sequences and iron-rich cherts, ranging from Precambrian to younger formations.

Uses & applications

Used as an ornamental stone, cabochon, bead, carving material, paperweight, and tumbled stone; it has little industrial value compared with ordinary quartz.

Geological facts

Its color intensity depends on iron-oxide content, while tiny quartz grains make it tougher and less translucent than agate. Surface white lines may be mineral veining or minor abrasion.

Field identification & locations

Identify it by its opaque red-brown color, very fine texture, lack of visible crystals, and inability to scratch it with a steel knife easily; common sources include India, Brazil, Madagascar, Australia, and the western United States.