mineral

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; opaque white to cream, smooth rounded surface, vitreous-to-waxy luster, and no visible cleavage. Quartz is trigonal, though crystal faces are absent from tumbling; specific gravity is about 2.65.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed from silica-rich hydrothermal fluids or igneous rocks, with specimens potentially ranging from Precambrian to younger ages. This piece has been mechanically tumbled and polished, likely from a commercial lapidary supply.

Uses & applications

Used as a decorative stone, worry stone, craft material, and inexpensive crystal specimen; quartz also has major industrial uses in glass, ceramics, electronics, and engineered stone.

Geological facts

Milky quartz appears white because microscopic fluid inclusions, fractures, or impurities scatter light. The pictured pebble’s unusually smooth, oval shape indicates deliberate tumbling rather than natural crystal growth.

Field identification & locations

Identify it by its white color, glassy/waxy surface, hardness, and lack of cleavage; it should scratch ordinary glass but not be scratched by a steel knife. Common source regions include Brazil, Madagascar, the United States, and India.