mineral

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to pale gray, with a vitreous-to-waxy luster and irregular fracture. It has a trigonal crystal structure, lacks cleavage, and typically has a specific gravity near 2.65.

Identified September 13, 2026More mineral →

Explore Milky quartz pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous rocks; the cloudy appearance results from microscopic fluid inclusions or fractures. Quartz is common from Precambrian to modern geological settings.

Uses & applications

Used for glass, ceramics, abrasives, electronics, and engineered stone; attractive pieces may be used as inexpensive lapidary material or specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. This small rounded specimen appears naturally weathered or tumbled, though its exact identification cannot be confirmed from the image alone.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and resistance to scratching; it should scratch ordinary glass but not be scratched by a steel knife. Common worldwide in stream gravels, veins, and quartz-rich rocks.