mineral

Tumbled milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Small polished, translucent white specimen with a vitreous-to-waxy luster and no visible cleavage; quartz has Mohs hardness 7, a trigonal crystal structure, and specific gravity about 2.65. The rounded shape indicates tumbling or water abrasion.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed from silica-rich fluids in veins, cavities, or igneous rocks; the specimen’s precise geological age and source cannot be determined from the image. Its cloudy appearance comes from microscopic fluid inclusions, fractures, or mineral impurities.

Uses & applications

Commonly sold as an inexpensive lapidary, craft, meditation, or pocket stone; quartz is also important in glass, electronics, abrasives, and construction materials.

Geological facts

Milky quartz is one of the most abundant quartz varieties. It can resemble white chalcedony, calcite, or man-made glass, but quartz is substantially harder than calcite and ordinary glass.

Field identification & locations

Likely quartz if it scratches glass and does not react with dilute hydrochloric acid; calcite fizzes and is much softer. Common sources include Brazil, Madagascar, the United States, and worldwide quartz veins.