mineral
Milky quartz (rough fragment)
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectTypically Mohs hardness 7, white to translucent, with a vitreous-to-greasy luster and hexagonal crystal structure; quartz lacks cleavage and breaks with conchoidal fracture. The image shows a small, irregular, opaque-white fragment.
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Physical properties
Typically Mohs hardness 7, white to translucent, with a vitreous-to-greasy luster and hexagonal crystal structure; quartz lacks cleavage and breaks with conchoidal fracture. The image shows a small, irregular, opaque-white fragment.
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
Used in glassmaking, electronics, abrasives, and construction aggregate; attractive pieces are collected or used in inexpensive jewelry.
Geological facts
Milky appearance results from microscopic fluid or gas inclusions that scatter light.
Field identification & locations
Look for glassy surfaces, no cleavage, and hardness sufficient to scratch ordinary glass; common worldwide in veins and many host rocks. The photo alone cannot confirm identification.
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