mineral

Polished brown jasper

Jasper, microcrystalline quartz (SiO₂), commonly containing iron-oxide and clay inclusions

AI-generated identification · may be incorrect

Opaque, caramel-to-dark-brown coloration with cloudy black iron-oxide zones; vitreous to waxy polish and no visible cleavage. Mohs hardness ~6.5–7; fine-grained cryptocrystalline quartz, typically specific gravity ~2.6.

Identified September 14, 2026More mineral →

Explore Polished brown jasper 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 producing the brown-red colors. Specimens may range from Paleozoic to recent hydrothermal or sedimentary deposits.

Uses & applications

Used for cabochons, tumbled stones, carvings, ornaments, and decorative objects; generally not used as a construction stone in small polished pieces.

Geological facts

Jasper is a variety of chalcedony/microcrystalline quartz rather than a distinct single mineral species. The opaque appearance distinguishes it from translucent agate and ordinary quartz.

Field identification & locations

Identify by its opaque earthy color, very fine texture, glassy polish, and ability to scratch ordinary glass; it should not react with dilute acid. Common sources include India, Madagascar, Brazil, Indonesia, and the western United States.