mineral

Tumbled milky quartz (likely quartz or quartz-rich chalcedony)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent milky-white to pale yellow, with a vitreous-to-waxy luster and no visible cleavage. The smooth oval shape indicates mechanical tumbling; cloudy appearance comes from microscopic fluid inclusions or fractures.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids and igneous melts, commonly in veins and pegmatites; these specimens may be hundreds of millions to billions of years old. Tumbling is a modern human finishing process.

Uses & applications

Used as an inexpensive ornamental, lapidary, and metaphysical stone; quartz is also important in glass, ceramics, electronics, and construction aggregate. Typical tumbled pieces have modest collector value.

Geological facts

Milky quartz is one of the most abundant quartz varieties. Its blue flashes may be reflections or minor iridescence rather than true color; a scratch test against glass can help confirm quartz.

Field identification & locations

Common worldwide, especially in Brazil, Madagascar, the United States, and other crystalline-rock regions. Confirm identity with hardness, conchoidal fracture, and lack of cleavage; a gemological test can distinguish it from pale jade, calcite, or glass.