mineral

Likely milky quartz pebble

Quartz (SiO₂), possibly iron-stained or weathered

AI-generated identification · may be incorrect

Rounded, opaque to slightly translucent white-gray surface with tan-brown staining and a dull to waxy luster. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65; the photo does not show crystal faces or a fresh fracture.

Identified September 23, 2026More mineral →

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Physical properties

Formation & geological history

Likely a quartz-rich pebble rounded by stream or beach transport, then weathered; quartz formed in many geological settings and can be far older than the sediment carrying it. The image alone cannot establish its age or exact source.

Uses & applications

Common quartz is used in glass, ceramics, electronics, and construction; this small rounded specimen is mainly suitable for collecting or display.

Geological facts

Quartz is one of Earth’s most abundant minerals and breaks with a curved, shell-like (conchoidal) fracture rather than splitting along cleavage planes.

Field identification & locations

Quartz pebbles are common in glacial and river deposits around northwestern Washington, making this a plausible regional match. A scratch test on an inconspicuous spot—quartz should scratch glass—can help distinguish it from softer lookalikes.