mineral

Tumbled jasper pebble

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

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque salmon-pink to tan with dark red-brown veins, earthy to vitreous luster, cryptocrystalline quartz, and no visible cleavage. The smooth rounded surface indicates natural water-wear or tumbling.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic or sedimentary material, commonly incorporating iron oxides that create red, brown, and pink patterns. Its precise geological age cannot be determined from the image; deposits occur from Precambrian to younger rocks.

Uses & applications

Used for cabochons, beads, carvings, tumbled stones, and ornamental objects; occasionally as decorative aggregate. This appears to be a common lapidary-grade pebble.

Geological facts

Jasper is an opaque variety of chalcedony or microcrystalline quartz, distinguished from agate by its lack of translucency. Its color patterns are caused mainly by hematite, limonite, and other iron minerals.

Field identification & locations

Identify it by its opaque appearance, waxy/vitreous polish, hardness, and red-brown iron staining; it should scratch glass but not be scratched by a steel blade. Common in volcanic terrains, alluvial gravels, and many worldwide jasper localities.