mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent gray-white color, vitreous to waxy luster, hexagonal crystal structure, and no true cleavage. The rounded shape indicates mechanical tumbling and polishing.

Identified August 9, 2026More mineral →

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Physical properties

Hardness 7 Mohs; translucent gray-white color, vitreous to waxy luster, hexagonal crystal structure, and no true cleavage. The rounded shape indicates mechanical tumbling and polishing.

Formation & geological history

Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic fluids; specimens may range from ancient Precambrian rocks to younger veins. This piece is a human-polished geological material.

Uses & applications

Used as a decorative stone, craft material, paper or glass additive, and occasional low-cost cabochon or jewelry stone.

Geological facts

Its cloudy appearance results from microscopic fluid inclusions, fractures, or fine mineral impurities. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify it by its glassy luster, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; a streak test should be white. Common sources include Brazil, Madagascar, the United States, and worldwide quartz veins.