mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectHardness 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.
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Physical properties
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.
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.
