mineral

Weathered quartz-rich pebble

Likely quartz-bearing rock; precise identification is limited by the blurry image

AI-generated identification · may be incorrect

Tan-brown, opaque to slightly translucent, with a dull earthy luster and irregular granular texture; likely hardness about 6–7 Mohs if quartz-rich. No clear cleavage or crystal faces are visible.

Identified August 23, 2026More mineral →

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Physical properties

Tan-brown, opaque to slightly translucent, with a dull earthy luster and irregular granular texture; likely hardness about 6–7 Mohs if quartz-rich. No clear cleavage or crystal faces are visible.

Formation & geological history

Probably a naturally weathered stream, soil, or glacial pebble formed from quartzite, sandstone, or another silicate rock; its geological age cannot be determined visually.

Uses & applications

Primarily a curiosity or inexpensive collected specimen; quartz-rich pebbles have broader uses in aggregate, construction stone, abrasives, and glass manufacture.

Geological facts

The brown coloration may result from iron-oxide staining. A glass-scratch test can help distinguish quartz-rich material from softer feldspar or limestone.

Field identification & locations

Common worldwide, especially in river gravels and eroded bedrock. Inspect for visible grains, test hardness against glass, and apply dilute vinegar only if carbonate minerals are suspected.