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 system, specific gravity about 2.65. The specimen appears massive and rough, with some tan surface staining.
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Physical properties
White to translucent, vitreous luster, irregular fracture and no cleavage; hardness 7 Mohs, trigonal crystal system, specific gravity about 2.65. The specimen appears massive and rough, with some tan surface staining.
Formation & geological history
Forms when silica-rich fluids crystallize in veins and fractures, or as a component of igneous and metamorphic rocks. Quartz is widespread across geological ages; the specimen’s age and exact origin cannot be determined from the image.
Uses & applications
Used for ornamental carvings, countertops, aggregate, and silica products; attractive pieces are collected, though this rough, common material is generally not gem-grade.
Geological facts
Quartz is among Earth’s most abundant minerals and can persist through weathering because of its hardness and chemical durability.
Field identification & locations
Identify by its glassy luster, hardness (it scratches glass), lack of cleavage, and conchoidal-to-irregular fracture. Common worldwide in veins, pegmatites, and many rock types.
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Mineral