metamorphic

Polished banded jasper pebble

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

AI-generated identification · may be incorrect

Opaque, fine-grained chalcedony/quartz with muted reddish-brown and olive bands; dull to waxy luster, no visible crystals or cleavage, Mohs hardness about 6.5–7, specific gravity roughly 2.5–2.7. The glossy surface appears polished or naturally water-worn.

Identified September 15, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when silica-rich fluids cement or replace sediment, with iron oxides producing the red-brown coloration; banding reflects changing sediment or fluid chemistry. Most jasper is Precambrian to younger, and this specimen’s exact age and locality cannot be determined from the image.

Uses & applications

Used for cabochons, beads, carvings, bookends, and ornamental stone; attractive polished pieces have modest lapidary value.

Geological facts

Jasper is an opaque variety of microcrystalline quartz, unlike translucent agate. Red coloration commonly comes from hematite or goethite.

Field identification & locations

Identify by its opaque, very fine texture, hardness, and resistance to scratching; it should scratch glass but not be scratched by a steel knife. Common in volcanic and sedimentary terrains worldwide, including the western United States, Australia, Brazil, India, and Madagascar.