mineral

Small translucent brown pebble, likely quartz or chalcedony

Quartz (SiO₂), possibly microcrystalline quartz (chalcedony)

AI-generated identification · may be incorrect

The small, rounded specimen appears translucent brown with a vitreous luster. If quartz, hardness is 7 Mohs, with hexagonal crystal structure and no cleavage; the image is insufficient to confirm its identity or specific gravity.

Identified October 16, 2026More mineral →

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Physical properties

Formation & geological history

Likely a water-worn fragment transported and rounded in sediment; quartz forms in many igneous, metamorphic, and sedimentary settings and spans a wide range of geological ages.

Uses & applications

A pebble of this size is mainly suitable for collecting or craft use; confirmed quartz and chalcedony are also used in jewelry and decorative objects.

Geological facts

Iron-oxide inclusions or staining can produce brown coloration in quartz and chalcedony.

Field identification & locations

Look for glassy luster and scratch resistance; quartz should scratch glass and resist a steel blade. Rounded pebbles are common in stream and beach gravels worldwide; testing or a clearer close-up would help distinguish quartz from other minerals.