mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, vitreous luster, with irregular fracture and no cleavage; Mohs hardness 7 and specific gravity about 2.65. The specimen appears to be a small, rough, massive or coarsely crystalline piece.
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Physical properties
White to translucent, vitreous luster, with irregular fracture and no cleavage; Mohs hardness 7 and specific gravity about 2.65. The specimen appears to be a small, rough, massive or coarsely crystalline piece.
Formation & geological history
Forms when silica-rich fluids crystallize in veins, cavities, or pegmatites, and also occurs in many igneous and metamorphic rocks. Quartz is found in rocks of widely varying geological ages.
Uses & applications
Quartz is used in glassmaking, electronics, abrasives, and decorative objects; attractive pieces may be collected or used in jewelry.
Geological facts
Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure.
Field identification & locations
Identify it by its glassy luster, hardness sufficient to scratch glass, and lack of cleavage; common worldwide, especially in quartz veins and pegmatites. The image alone cannot establish a more specific locality or variety.
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Epidote
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Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
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