mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster and irregular conchoidal fracture; hardness 7 Mohs, no cleavage, trigonal crystal structure, and specific gravity about 2.65. The specimen appears massive and rough, with minor iron-oxide staining.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, fractures, and cavities, commonly in igneous, metamorphic, and hydrothermal settings. Quartz is geologically widespread and may range from Precambrian to recent formations; its exact age cannot be determined from the photograph.

Uses & applications

Used in glass, ceramics, engineered stone, abrasives, electronics, and construction aggregate; attractive translucent pieces are sold as specimens or occasionally carved and polished.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or defects scattering light. It can scratch ordinary steel and glass, helping distinguish it from softer white minerals.

Field identification & locations

Common in quartz veins, pegmatites, granite, and metamorphic rocks worldwide. Confirm with a glass-scratch test and lack of cleavage; calcite is softer and reacts with dilute acid, while feldspar shows cleavage.