mineral

Polished jasper pebble

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

AI-generated identification · may be incorrect

Opaque cream-white center with reddish-brown margins, vitreous to waxy luster, and conchoidal fracture; quartz hardness is about 6.5–7 Mohs, with no cleavage. The rounded, glossy surface indicates tumbling or natural abrasion.

Identified August 31, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediment, or rock, with iron oxides producing red-brown coloration; deposits range from Precambrian to younger ages. This specimen may also be brecciated or orbicular jasper, though the image alone cannot confirm the variety.

Uses & applications

Used for cabochons, beads, carvings, paperweights, and decorative polished stones; common pieces have modest jewelry and collecting value.

Geological facts

Jasper is a cryptocrystalline variety of quartz related to chert and agate, but it is generally opaque because of abundant impurities.

Field identification & locations

Commonly found in volcanic and sedimentary terrains worldwide, including the western United States, Brazil, Madagascar, India, and Australia. Identify it by its opacity, earthy iron-stained patterns, fine grain, and inability to scratch glass only inconsistently depending on surface polish.