mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent gray, with a vitreous-to-dull luster and irregular fracture; hardness 7 on Mohs scale, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The specimen appears rough and massive, with possible surface weathering.
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Physical properties
White to translucent gray, with a vitreous-to-dull luster and irregular fracture; hardness 7 on Mohs scale, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The specimen appears rough and massive, with possible surface weathering.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and fractures, or during cooling of silica-rich magma. Quartz occurs in rocks of many ages, from ancient crust to recent veins.
Uses & applications
Commonly used as a source of silica in glass and ceramics, and as decorative stone or a low-cost lapidary material.
Geological facts
Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure.
Field identification & locations
Identify by its glassy appearance, lack of cleavage, and ability to scratch glass; a steel knife generally will not scratch it. Common worldwide, especially in quartz veins and pegmatites; the image alone cannot confirm the identification.
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