mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; opaque to translucent creamy-white color, vitreous to waxy luster, and conchoidal fracture. It has a trigonal crystal structure but no visible cleavage; specific gravity is about 2.65.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Likely natural quartz rounded by water or deliberately tumbled and polished; its milky appearance comes from microscopic fluid inclusions or fractures. Quartz formed in igneous, hydrothermal, and metamorphic environments across many geological ages.

Uses & applications

Used for decorative stones, cabochons, carvings, countertops, glass, and electronics; this small specimen has modest collector value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the main component of granite, sandstone, and many veins. The smooth shape and uniform polish indicate human tumbling rather than a crystal face.

Field identification & locations

Identify it by its hardness, pale color, glassy luster, lack of cleavage, and inability to scratch it with a steel knife (though quartz scratches glass). Common sources include quartz veins, river gravels, Brazil, Madagascar, and the United States.