sedimentary

Red jasper pebble

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

AI-generated identification · may be incorrect

Opaque reddish-brown, fine-grained, waxy to dull luster with scattered pale inclusions; quartz hardness about 6.5–7 Mohs, no cleavage, conchoidal fracture, specific gravity about 2.6. The smoothly rounded shape indicates natural water abrasion or tumbling.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Jasper forms when silica-rich fluids cement or replace fine sediment, commonly with hematite or other iron oxides producing the red color. It may form in volcanic-sedimentary environments over a wide range of geological ages; the specimen’s exact age cannot be determined visually.

Uses & applications

Used for cabochons, beads, carvings, decorative stone, and lapidary practice; dense jasper is occasionally used as ornamental tile or facing stone.

Geological facts

Jasper is an opaque variety of chalcedony or microcrystalline quartz, unlike translucent agate. Red coloration generally reflects finely dispersed hematite or limonite.

Field identification & locations

Identify it by its opaque red color, uniform fine texture, hardness, and ability to scratch glass; it should not fizz in dilute acid. Common sources include India, Madagascar, Brazil, Uruguay, the western United States, and Australia.