mineral

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Mostly white to translucent with a vitreous-to-waxy luster and irregular fracture; quartz has a Mohs hardness of 7, trigonal crystal structure, no cleavage, and specific gravity around 2.65. The rounded shape indicates abrasion during transport or tumbling.

Identified September 26, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich fluids and is common in many igneous, metamorphic, and sedimentary settings; this pebble was likely weathered from quartz-rich rock and transported in sediment. Quartz forms across a wide range of geological ages.

Uses & applications

Common quartz is used in glassmaking, abrasives, and electronic components; attractive pieces are collected or used decoratively.

Geological facts

Milky appearance results from tiny fluid or gas inclusions that scatter light. Quartz is one of Earth’s most abundant and durable minerals.

Field identification & locations

Identify it by its glassy sheen, hardness (it can scratch ordinary glass), lack of cleavage, and irregular fracture; white rounded pebbles are widespread in river, beach, and gravel deposits. A single common pebble typically has little commercial value.