mineral

White quartz pebble

Quartz (SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, hexagonal crystal structure, no cleavage, conchoidal fracture, specific gravity about 2.65. Its smooth oval shape indicates natural water-worn or tumbled material.

Identified August 7, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic fluids; milky color results from microscopic fluid inclusions and fractures. Quartz is abundant from Precambrian to modern deposits, and this specimen is likely a modern river pebble or tumbled stone.

Uses & applications

Used in glass, ceramics, electronics, abrasives, and engineered stone; attractive pieces are used for décor and inexpensive cabochons or jewelry.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. The white appearance commonly reflects trapped fluids rather than a separate mineral impurity.

Field identification & locations

Identify by its glassy/waxy appearance, lack of cleavage, hardness, and inability to be scratched by steel; it should scratch ordinary glass. Common in river gravels, quartz veins, beaches, and pegmatites.