mineral

Red jasper pebble

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

AI-generated identification · may be incorrect

Opaque reddish-brown, rounded and smooth, with a dull to waxy luster; quartz has Mohs hardness 7 and trigonal crystal structure, though individual crystals are too fine to see. The image alone cannot confirm composition; the specimen may be a naturally rounded pebble or tumbled stone.

Identified October 14, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids or sediments become cemented or altered, with iron oxides imparting color. Its age and precise formation setting cannot be determined from the photo.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; also collected as a common ornamental stone.

Geological facts

Jasper is an opaque form of chalcedony, unlike transparent quartz varieties; patterns and colors vary with mineral impurities.

Field identification & locations

Look for opaque, fine-grained red or brown material and a smooth, waxy surface; jasper occurs in many regions worldwide. A hardness or streak test can help distinguish it, but avoid damaging a polished specimen.