mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Typically Mohs hardness 7, vitreous to waxy luster, white translucent color caused by microscopic fluid inclusions, and a trigonal crystal structure; fracture is conchoidal with no cleavage. The smooth oval shape indicates mechanical tumbling and polishing.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous rocks; milky varieties commonly form in veins. Quartz is geologically widespread and occurs from Precambrian to modern formations.

Uses & applications

Used as a low-cost ornamental, lapidary, and metaphysical stone; quartz is also important industrially in glass, ceramics, electronics, and abrasives.

Geological facts

The photograph supports a polished quartz identification, but similar-looking calcite, chalcedony, or white glass cannot be excluded without testing.

Field identification & locations

Look for hardness sufficient to scratch ordinary glass, a cool feel, and conchoidal fracture; calcite is softer and fizzes weakly in dilute acid. Common sources include Brazil, Madagascar, India, the United States, and worldwide quartz veins.