mineral

Tumbled milky quartz (probable)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White to cream, translucent to opaque, with a vitreous-to-waxy polish and no visible cleavage; Mohs hardness 7, hexagonal crystal structure, and specific gravity about 2.65. The rounded forms indicate tumbling or natural water abrasion; lighting may exaggerate translucency.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous rocks, commonly forming over hundreds of millions to billions of years. These pieces were likely collected from quartz-rich veins or alluvial deposits and then mechanically tumbled.

Uses & applications

Used for decorative stones, crafts, countertops, abrasives, and quartz crystal products; attractive translucent pieces are inexpensive jewelry or worry stones.

Geological facts

Milky quartz contains microscopic fluid inclusions, fractures, or impurities that scatter light and create its cloudy appearance. The image does not show diagnostic crystal faces, so white chalcedony or calcite remains a possibility.

Field identification & locations

Field tests: quartz scratches ordinary glass and is not scratched by a steel knife; it lacks calcite’s strong reaction to dilute acid. Common sources include Brazil, Madagascar, the United States, and India.