mineral

Tumbled brown quartz/chalcedony (probable)

Quartz, SiO₂; possibly brown chalcedony or jasper

AI-generated identification · may be incorrect

Smooth, rounded, opaque-to-translucent brown specimen with a glassy-to-waxy luster; quartz hardness is 7 Mohs, chalcedony about 6.5–7. Crystalline quartz is trigonal, while chalcedony is cryptocrystalline; cleavage is absent and specific gravity is about 2.6.

Identified August 11, 2026More mineral →

Explore Tumbled brown quartz/chalcedony (probable) 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

Likely a mechanically tumbled and polished silica-rich pebble, originally formed from hydrothermal veins or silica-rich volcanic/sedimentary material. The image cannot establish its geological age or exact variety.

Uses & applications

Used as a low-cost lapidary, decorative, and metaphysical stone; suitable for cabochons, beads, and polished collections. Common tumbled pieces generally sell for $1–$10.

Geological facts

Brown coloration may come from iron oxides or inclusions; similar material is often sold as brown jasper, smoky quartz, or petrified wood. The blurred image prevents a definitive identification.

Field identification & locations

Commonly found in gravel deposits, river beds, volcanic terrains, and quartz-bearing veins worldwide; test with a steel file or glass cautiously—true quartz should scratch glass. Better identification requires a sharp photograph, translucency check, streak test, and possibly specific-gravity testing.