mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure. The specimen appears water-worn and frosted, likely from surface abrasion.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in igneous, metamorphic, or hydrothermal settings; milky appearance results from microscopic fluid inclusions and fractures. Its exact geological age and source cannot be determined from the image.

Uses & applications

Used as aggregate, silica feedstock, abrasives, glass, and ceramics; attractive pieces are collected or used decoratively. This small rounded specimen has minimal commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, allowing it to persist as stream and beach pebbles. It can scratch ordinary glass and steel.

Field identification & locations

Common worldwide, especially in quartz veins, granite-derived gravels, riverbeds, and beaches. Confirm with a glass-scratch test, lack of cleavage, and conchoidal fracture; avoid testing valuable specimens.