mineral

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, rounded by tumbling, with no visible cleavage and likely hardness Mohs 7; specific gravity about 2.65. The cloudy appearance comes from microscopic fluid inclusions or structural defects.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids and igneous or metamorphic processes, with specimens ranging from ancient to modern geological ages; this piece appears human-tumbled and polished.

Uses & applications

Commonly sold as a lapidary, decorative, and beginner mineral specimen; used in jewelry, carvings, ornaments, and industrial silica applications. Its modest value is primarily aesthetic.

Geological facts

Quartz is one of Earth’s most abundant minerals and has a hexagonal crystal structure, although tumbling obscures the original crystal form.

Field identification & locations

Identify it by its white translucency, glassy sheen, lack of cleavage, and resistance to scratching; it should scratch ordinary window glass but not be tested on valuable surfaces. Common sources include Brazil, Madagascar, the United States, and worldwide quartz veins.