mineral

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent with a vitreous-to-waxy luster, no cleavage, and conchoidal fracture. It has a trigonal crystal structure, though tumbling has removed natural crystal faces; specific gravity is about 2.65.

Identified September 17, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic fluids, commonly over geologic time from Precambrian to recent ages. The rounded shape indicates human tumbling and polishing rather than natural weathering.

Uses & applications

Used for decorative stones, crafts, lapidary work, countertops, glassmaking, ceramics, and electronics; translucent pieces may be used in inexpensive jewelry. This specimen is typically worth about $1–$5.

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 chemically durable minerals.

Field identification & locations

Identify it by its white translucency, glassy luster, lack of cleavage, and ability to scratch ordinary glass; a steel blade will not scratch it. Common sources include Brazil, Madagascar, the United States, and many quartz-rich regions worldwide.