mineral

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

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

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous or hydrothermal fluids and is also common in metamorphic rocks; its geological age depends on the source deposit. The specimen was later shaped and polished by human processing.

Uses & applications

Used for inexpensive ornaments, cabochons, crafts, meditation stones, and decorative objects; it has little industrial value as an individual tumbled piece.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or dispersed mineral impurities that scatter light. Quartz is one of Earth’s most abundant and durable minerals.

Field identification & locations

Identify it by its hardness, lack of cleavage, translucent white appearance, and glassy fracture; it should scratch ordinary glass but not be scratched by a steel knife. Common sources include Brazil, Madagascar, the United States, and many quartz-rich regions.