mineral

Polished jasper pebble

Jasper, an opaque variety of microcrystalline quartz (SiO₂), with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque cream, red-brown, and gray patterning; waxy to vitreous luster when polished; microcrystalline quartz, with no visible cleavage and conchoidal fracture. The pictured piece appears polished or naturally water-worn.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids or sediments become silicified, often with iron oxides producing red and brown colors. It occurs in rocks of many geological ages; the image alone cannot establish its precise origin or age.

Uses & applications

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

Geological facts

Jasper is a variety of chalcedony and is valued for its opaque colors and distinctive patterns.

Field identification & locations

Look for opaque, dense material with mottled or banded colors and hardness sufficient to scratch glass; common sources include Brazil, India, Madagascar, and the western United States. The photo does not allow reliable identification of a specific jasper variety.