mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, hexagonal crystal structure, and no true cleavage (conchoidal fracture). The cloudy appearance comes from microscopic fluid inclusions or defects.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich hydrothermal fluids cool in veins, cavities, and pegmatites; specimens may range from ancient Precambrian rocks to modern mineralized veins. The pictured rough white piece is consistent with common vein quartz.

Uses & applications

Used for glass, ceramics, abrasives, engineered stone, and electronics; attractive translucent pieces are sold as inexpensive specimens or carved ornaments.

Geological facts

Quartz is one of Earth’s most abundant minerals and a major component of granite, sandstone, and many metamorphic rocks. Milky quartz commonly forms alongside feldspar, mica, and metallic sulfide minerals.

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; it should not be scratched by a steel knife. Common worldwide, especially in hydrothermal veins and pegmatites.