mineral

Tumbled milky quartz (likely quartzite or chalcedony)

Quartz, SiO₂; possibly microcrystalline chalcedony

AI-generated identification · may be incorrect

White to cream, translucent, with a vitreous-to-waxy luster and a visible healed/fracture seam. Quartz has Mohs hardness 7, hexagonal crystal structure, no cleavage, conchoidal fracture, and specific gravity about 2.65; the rounded shape is human-tumbled.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed from silica-rich fluids or cooling igneous rocks; quartzite forms when sandstone is metamorphosed, while chalcedony precipitates in cavities. The specimen’s geological age cannot be determined from the photograph.

Uses & applications

Used as a decorative stone, lapidary material, countertop aggregate, and inexpensive jewelry or meditation stone. Common tumbled pieces generally have modest value.

Geological facts

The cloudy appearance results from microscopic fluid inclusions, fractures, or fine-grained quartz. The central line may be a natural healed fracture, and a polished surface can obscure diagnostic crystal faces.

Field identification & locations

Common in quartz-rich gravels, veins, pegmatites, and metamorphic terrains worldwide; major sources include Brazil, Madagascar, the United States, and India. A glass-scratching test can support quartz identification, but avoid damaging the polished specimen.