metamorphic

Polished jasper pebble

Microcrystalline quartz (SiO₂), commonly with hematite/goethite and iron-rich clay inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque to slightly translucent, reddish-brown, cream, and golden coloration; waxy to dull luster; cryptocrystalline quartz with no visible cleavage. The rounded shape and glossy surface indicate tumbling or natural water abrasion.

Identified September 18, 2026More metamorphic →

Explore Polished jasper pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Jasper forms when silica-rich fluids replace or cement volcanic ash, sediments, or other rocks, with iron oxides producing red and brown colors. Formation ages vary widely, commonly Precambrian to younger, depending on the deposit.

Uses & applications

Used for cabochons, beads, carvings, ornamental objects, and lapidary specimens; occasionally used as aggregate or decorative stone.

Geological facts

Color patterns arise from iron oxides and brecciation, and each piece is distinctive. It may be marketed under names such as picture jasper, brecciated jasper, or mookaite depending on its exact pattern and locality.

Field identification & locations

Identify it by its opaque appearance, colorful iron-rich patterns, glassy/waxy polish, and lack of obvious individual crystals; a steel file generally scratches it only with difficulty. Common sources include Australia, India, Madagascar, Brazil, and the western United States.