mineral
Milky quartz
Quartz (SiO₂)
AI-generated identification · may be incorrectWhite to translucent, glassy-to-dull luster, irregular fracture, no cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The specimen appears to be massive, fractured quartz.
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Physical properties
White to translucent, glassy-to-dull luster, irregular fracture, no cleavage; Mohs hardness 7, trigonal crystal structure, specific gravity about 2.65. The specimen appears to be massive, fractured quartz.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, or from cooling silica-rich melts. Quartz occurs in rocks of many ages and geological settings.
Uses & applications
Used as a silica source in glass and ceramics, in construction aggregate, and as an inexpensive ornamental or lapidary material.
Geological facts
Its cloudy appearance comes from microscopic fluid or gas inclusions and structural imperfections.
Field identification & locations
Identify by its hardness (scratches glass), lack of cleavage, and conchoidal-to-irregular fracture; common worldwide in quartz veins and many rock types. The image alone cannot establish its exact source or age.
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