mineral

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

White, opaque to translucent, with a vitreous-to-waxy luster and no visible cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The small, worn specimen’s appearance is consistent with milky quartz, though the photo cannot confirm the identification.

Identified October 12, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms when silica-rich fluids crystallize in veins and cavities, or during cooling of silica-rich magma; it occurs in rocks of many geological ages. Its white cloudiness usually results from microscopic fluid or gas inclusions.

Uses & applications

Commonly used as a silica source in glassmaking and other industries; attractive pieces are used in ornaments and mineral collections.

Geological facts

Quartz is one of Earth’s most abundant minerals and produces a conchoidal fracture rather than splitting along cleavage planes.

Field identification & locations

Look for hardness sufficient to scratch glass, a glassy luster, and irregular curved fracture surfaces; quartz is widespread in veins, pegmatites, and many rock types. The pictured piece is too small and indistinct for a confident field identification.