mineral

Likely brown jasper or iron-stained chert

Microcrystalline quartz (SiO₂), with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque brown, cream, and dark mottled material with a dull to waxy luster; likely hardness 6.5–7 Mohs, no obvious cleavage, and conchoidal fracture. The image is somewhat unclear, so exact identification is limited.

Identified August 14, 2026More mineral →

Explore Likely brown jasper or iron-stained chert 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

Forms when silica-rich fluids replace or cement sediments, with iron oxides producing the reddish-brown coloration. Commonly Cenozoic to Precambrian in age, depending on the deposit.

Uses & applications

Used as lapidary material for cabochons, beads, carvings, and decorative stone; occasionally used as a minor aggregate. This specimen appears more suitable for collecting than high-value jewelry.

Geological facts

Jasper and chert are varieties of chalcedony or microcrystalline quartz, and their patterns commonly result from mineral replacement and oxidation. A glassy edge or conchoidal chip would support a chert/jasper identification.

Field identification & locations

Commonly found in volcanic terrains, sedimentary iron formations, and gravel deposits worldwide, including the western United States, Australia, Brazil, and India. Test cautiously with a steel file: genuine quartz-rich material should resist scratching; inspect for a waxy texture and curved fracture.