mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, vitreous luster, irregular fracture and no cleavage; hardness 7 Mohs, trigonal crystal structure, specific gravity about 2.65. The specimen appears massive and somewhat weathered.
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Physical properties
White to translucent, vitreous luster, irregular fracture and no cleavage; hardness 7 Mohs, trigonal crystal structure, specific gravity about 2.65. The specimen appears massive and somewhat weathered.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and cavities, or during cooling of silica-rich magma. Quartz occurs in rocks of many ages and geological settings.
Uses & applications
Used as a silica source in glassmaking and other industries; attractive pieces are used in lapidary work, décor, and mineral collections.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly occurs with feldspar in continental rocks.
Field identification & locations
Identify by its glassy luster, hardness (scratches glass), and lack of cleavage; common worldwide in veins, pegmatites, and many igneous and metamorphic rocks. A photo alone cannot confirm the identification.
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Epidote
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Granite (Phaneritic intrusive igneous rock)
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