mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to translucent, with a vitreous to dull luster; it has a hexagonal crystal structure but commonly occurs as massive, rounded pebbles with no obvious cleavage. The yellow-brown areas are likely iron-oxide staining or surface weathering.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks; the pebble was later released by weathering and rounded by stream or beach transport. Quartz is found in rocks ranging from Precambrian to modern deposits.

Uses & applications

Used in glassmaking, ceramics, abrasives, engineered stone, and electronics; attractive pieces are collected, polished, or used in inexpensive decorative items.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or inclusions scattering light. Quartz is one of Earth’s most abundant and durable minerals.

Field identification & locations

Identify by its hardness, glassy fracture, lack of cleavage, and inability to scratch with a steel knife while scratching ordinary glass. Common in stream gravels, beaches, quartz veins, and granitic terrains; this specimen may also be quartz-rich quartzite.