mineral

Likely iron-stained quartz/chalcedony pebble

Silicon dioxide (SiO₂), probably quartz or microcrystalline chalcedony with iron-oxide staining

AI-generated identification · may be incorrect

Brown to honey-colored, translucent patches, vitreous to waxy luster, irregular fracture, and no obvious cleavage; hardness about Mohs 6.5–7, specific gravity ~2.6. The rounded shape suggests a naturally worn or tumbled fragment.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica precipitated in a cavity, vein, or sediment and was later stained orange-brown by hydrated iron oxides such as limonite. Exact age and locality cannot be determined from the photograph.

Uses & applications

Quartz and chalcedony are used for abrasives, glass, ceramics, countertops, and lapidary work; attractive pieces may be polished for cabochons or collected.

Geological facts

The brown coloration is commonly a surface coating or pore-filling stain rather than the intrinsic color of quartz. A steel file should not easily scratch it, while it can scratch ordinary glass.

Field identification & locations

Common in gravel deposits, riverbeds, weathered veins, and hydrothermal settings worldwide; inspect for conchoidal fracture, glassy translucence, and hardness. It could also be jasper or iron-stained agate, but the image is insufficient for a precise identification.