mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, commonly massive rather than visibly crystalline; Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The smooth rounded shape indicates mechanical tumbling and polishing.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

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

Uses & applications

Used for ornamental stones, lapidary pieces, countertops, glass, ceramics, electronics, and abrasives; this small specimen has modest decorative or collecting value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure.

Field identification & locations

Identify it by its glassy appearance, hardness, lack of cleavage, and inability to be scratched by a steel knife; it should scratch ordinary glass. Common worldwide, including Brazil, Madagascar, the United States, and alpine regions.