mineral

Tumbled milky quartz (likely quartzite or chalcedony)

Quartz, SiO₂; precise identification requires hardness or microscopic testing

AI-generated identification · may be incorrect

Creamy translucent color, vitreous-to-waxy luster, no visible cleavage, and rounded tumble-polished form; quartz hardness is Mohs 7 and specific gravity about 2.65. The cloudy appearance comes from microscopic inclusions, fractures, or fluid-filled zones.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, metamorphic, and hydrothermal environments over widely varying geologic ages; quartzite is metamorphosed sandstone, while chalcedony is microcrystalline silica deposited from fluids. This specimen has been human-tumbled and polished.

Uses & applications

Used as a decorative stone, craft material, gemstone, and lapidary medium; quartz and quartzite also have major industrial uses in glass, ceramics, abrasives, and construction.

Geological facts

The image cannot reliably distinguish massive quartz from quartzite or pale chalcedony. A steel file should not scratch quartz, while a knife may scratch softer look-alikes.

Field identification & locations

Common worldwide, especially in quartz veins, quartz-rich gravels, pegmatites, and metamorphic terrains; check hardness, streak (white), translucency, and absence of cleavage. Likely sources include Brazil, Madagascar, India, and the United States.