mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, glassy-to-waxy luster, irregular conchoidal fracture, no cleavage, and Mohs hardness 7; the rounded shape indicates tumbling or polishing. Crystal structure is trigonal, though individual crystals are not visible.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids and occurs widely in veins and metamorphic rocks; its geological age may range from recent deposits to billions of years. The specimen was likely mechanically tumbled and polished.

Uses & applications

Used as a decorative or lapidary stone, craft material, and inexpensive cabochon or jewelry component; quartz is also important industrially in glass, electronics, and engineered stone.

Geological facts

Milky color results from microscopic fluid inclusions, fractures, or impurities that scatter light. Quartz is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Identify it by its hardness, pale color, lack of cleavage, and inability to scratch it with a steel knife while scratching glass. Common sources include Brazil, Madagascar, the United States, and worldwide quartz veins.