mineral
Polished jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay inclusions
AI-generated identification · may be incorrectOpaque 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.
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Physical properties
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.
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.
