mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Usually white to translucent with a vitreous-to-waxy luster; hardness 7 Mohs, no cleavage, conchoidal fracture, and hexagonal crystal structure. The specimen appears massive and granular, possibly with minor feldspar or weathering stains.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, pegmatites, or igneous rocks; it occurs from ancient Precambrian rocks to modern hydrothermal deposits. Exact age and locality cannot be determined from the photograph.

Uses & applications

Common quartz is used in glassmaking, ceramics, abrasives, engineered stone, and electronics; attractive pieces are sold as inexpensive mineral specimens.

Geological facts

Milky color results from microscopic fluid inclusions, fractures, or defects that scatter light. Quartz can scratch ordinary glass and leaves no visible cleavage surfaces when broken.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch glass; a steel blade will not scratch it. Common worldwide, especially in quartz veins, granites, and pegmatites.