mineral

Tumbled white quartz pebble

Quartz, silicon dioxide (SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, glassy-to-waxy luster, hexagonal crystal structure, no cleavage, conchoidal fracture, specific gravity about 2.65. Dark patches may be iron/manganese staining or included host material.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous or hydrothermal fluids and is highly resistant to weathering; this specimen was likely naturally rounded and then tumbled or polished. Quartz formed throughout geologic time, commonly in veins and igneous/metamorphic rocks.

Uses & applications

Used for glass, ceramics, electronics, abrasives, and countertops; attractive pieces are sold as décor, worry stones, or inexpensive collectibles.

Geological facts

Milky quartz appears opaque because microscopic fluid inclusions and fractures scatter light. It commonly occurs with feldspar, mica, and metallic sulfide minerals.

Field identification & locations

Identify by its pale color, hardness, lack of cleavage, and glassy fracture; it should scratch ordinary glass but not be scratched by a steel knife. Common worldwide, especially in quartz veins and granitic terrains.