mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically white to translucent with a vitreous-to-dull luster and irregular fracture; hardness 7 Mohs, trigonal crystal structure, no cleavage, specific gravity about 2.65. The pictured rough, cloudy specimen is consistent with massive milky quartz.
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Physical properties
Typically white to translucent with a vitreous-to-dull luster and irregular fracture; hardness 7 Mohs, trigonal crystal structure, no cleavage, specific gravity about 2.65. The pictured rough, cloudy specimen is consistent with massive milky quartz.
Formation & geological history
Forms when silica-rich fluids crystallize in veins or cavities, and also occurs in igneous and metamorphic rocks. Quartz is geologically widespread and forms across many ages.
Uses & applications
Used as an industrial silica source, in glass and engineered surfaces, and as an inexpensive ornamental or lapidary material.
Geological facts
Quartz is one of Earth’s most abundant minerals; its hardness makes it resistant to scratching by most common materials.
Field identification & locations
Look for a glassy sheen, hardness sufficient to scratch ordinary glass, and lack of cleavage; common in quartz veins and many rock types worldwide. A photo alone cannot establish exact identification.
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