mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, and hexagonal crystal structure (not visible after tumbling). Specific gravity is about 2.65.

Identified September 18, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in igneous, metamorphic, or hydrothermal environments; milky appearance comes from microscopic fluid inclusions or fractures. Quartz is geologically widespread and occurs from ancient rocks to modern veins and sediments.

Uses & applications

Used for lapidary carvings, beads, cabochons, ornaments, and inexpensive jewelry; quartz also has major glass, ceramic, electronics, and industrial uses.

Geological facts

The rounded surface indicates human tumbling and polishing. Its cloudy white appearance distinguishes it from clear rock crystal, though similar-looking material may include white chalcedony or calcite.

Field identification & locations

Identify by its glassy feel, hardness— it should scratch ordinary glass—and lack of cleavage; calcite is softer and reacts with dilute acid. Common worldwide, especially in quartz veins, granites, pegmatites, and metamorphic rocks.