mineral

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, conchoidal fracture, no cleavage, hexagonal crystal structure, and specific gravity about 2.65. The rounded shape indicates mechanical tumbling and polishing.

Identified August 26, 2026More mineral →

Explore Tumbled milky quartz 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

Quartz crystallizes from silica-rich igneous, metamorphic, or hydrothermal fluids; milky color results mainly from microscopic fluid inclusions and defects. Quartz formed throughout Earth’s geologic history, commonly in veins and pegmatites.

Uses & applications

Used as a decorative tumbled stone, lapidary material, and inexpensive jewelry or craft component; quartz also has major industrial uses in glass, ceramics, electronics, and engineered stone.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Milky quartz is generally less transparent and less valuable than clear rock crystal.

Field identification & locations

Identify it by its white translucent appearance, glassy luster, lack of cleavage, and ability to scratch ordinary glass; a steel file will not scratch it easily. Common sources include Brazil, Madagascar, the United States, and many quartz-bearing regions.