mineral

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline to coarse-grained quartz aggregate

AI-generated identification · may be incorrect

White to translucent cream, vitreous-to-waxy luster, no visible cleavage, conchoidal fracture, Mohs hardness 7, and specific gravity about 2.65. The rounded edges indicate mechanical tumbling and polishing; internal fractures create the cloudy appearance.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous melts, hydrothermal fluids, or metamorphic veins; its original formation may range from Precambrian to recent. This specimen was later cut or tumbled by humans.

Uses & applications

Commonly sold as a lapidary and metaphysical stone, cabochon, ornament, or jewelry component; quartz is also important industrially in glass, ceramics, electronics, and engineered stone.

Geological facts

Milky quartz owes its opacity to microscopic fluid inclusions, fractures, or dispersed impurities rather than a different chemical composition. It can resemble white calcite or marble, but is substantially harder.

Field identification & locations

Likely identification: a small polished/tumbled quartz pebble. Scratch testing with steel is inconclusive, while quartz should scratch glass; calcite will not. Common sources include Brazil, Madagascar, the United States, and worldwide quartz veins.