mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; white to translucent with a vitreous luster, no cleavage, and irregular to conchoidal fracture. It has a trigonal crystal structure, though this specimen is massive rather than well-formed crystals.
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Physical properties
Hardness 7 Mohs; white to translucent with a vitreous luster, no cleavage, and irregular to conchoidal fracture. It has a trigonal crystal structure, though this specimen is massive rather than well-formed crystals.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, or during igneous and metamorphic processes. Quartz occurs in rocks of many geological ages.
Uses & applications
Commonly used as a source of silica in glassmaking and industrial materials; attractive pieces are collected or used in decorative objects and jewelry.
Geological facts
Its cloudy appearance comes from microscopic fluid or gas inclusions and structural imperfections.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage; common worldwide, especially in quartz veins and pegmatites. Similar-looking calcite is much softer and may react with acid.
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