mineral

White chalcedony or quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly with minor calcite or feldspar

AI-generated identification · may be incorrect

Smooth, rounded, pale white to bluish-gray, with a dull to waxy luster and no visible crystal faces. Quartz hardness is about 7 Mohs; specific gravity is approximately 2.6, though the apparent softness may reflect weathering or a carbonate-rich composition.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

Likely a naturally water-worn pebble formed from silica-rich vein material, chert, or quartz-bearing rock; it may also be a tumbled commercial specimen. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used as a decorative stone, lapidary material, landscaping pebble, and occasionally in jewelry or carvings. Common pieces have little commercial value.

Geological facts

The rounded shape and surface texture indicate abrasion by water, sediment, or tumbling. A glassy scratch test can help distinguish quartz from softer white minerals.

Field identification & locations

Commonly found in streambeds, beaches, gravel deposits, and weathered quartz veins worldwide. It should scratch glass if quartz-rich; vinegar fizz suggests calcite, while a steel nail generally will not scratch quartz.