mineral

Iron-stained milky quartz pebble

Quartz (SiO₂), with iron-oxide/hydroxide staining; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Mostly opaque white to gray quartz with ochre-brown patches and a wet, slightly glassy surface. Quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and conchoidal fracture; the pictured piece appears water-worn and may be naturally fractured rather than polished.

Identified September 28, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as vein or fracture-filling quartz, later stained by iron-rich fluids and rounded by weathering or water transport. Its age and source cannot be determined from appearance alone.

Uses & applications

Common quartz is used in glassmaking, engineered stone, and electronics; this small specimen is chiefly suitable for collecting or display.

Geological facts

The brown coloration commonly comes from iron oxides such as goethite or hematite coating or staining the quartz.

Field identification & locations

Look for hardness near 7, glassy luster, and lack of cleavage; quartz is widespread in many rock types and stream gravels. A photo cannot establish its precise variety or locality.