sedimentary

Rounded quartz-rich pebble

Lithic pebble; likely quartz/quartzite with iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; tan-pink, granular and somewhat translucent, with a dull to weakly vitreous luster. The rounded shape reflects abrasion; individual mineral cleavage is not evident.

Identified September 12, 2026More sedimentary →

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Physical properties

Hardness about 6.5–7 Mohs; tan-pink, granular and somewhat translucent, with a dull to weakly vitreous luster. The rounded shape reflects abrasion; individual mineral cleavage is not evident.

Formation & geological history

This is a beach or river pebble produced by weathering and mechanical erosion of quartz-bearing rock, followed by transport and rounding. Its exact geological age and parent rock cannot be determined from the photograph.

Uses & applications

Primarily a natural collectible or decorative pebble; similar quartzite material can be used as aggregate, landscaping stone, or occasionally lapidary material.

Geological facts

Quartz-rich pebbles commonly survive transport better than softer minerals, so they become concentrated in gravel beaches and streambeds. The pink-brown coloration likely comes from iron oxides or feldspar-rich inclusions.

Field identification & locations

Identify it by its rounded form, granular quartz-like appearance, high hardness, and resistance to scratching by a steel blade; it should not scratch glass if heavily weathered or iron-rich. Common in gravel deposits, beaches, and riverbeds worldwide.