mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, with a vitreous-to-dull luster and irregular fracture; hardness 7 Mohs, no cleavage, and a trigonal crystal structure. The specimen appears rough and weathered; identification from the image is provisional.
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Physical properties
White to translucent, with a vitreous-to-dull luster and irregular fracture; hardness 7 Mohs, no cleavage, and a trigonal crystal structure. The specimen appears rough and weathered; identification from the image is provisional.
Formation & geological history
Forms when silica-rich fluids crystallize in veins or cavities, and also occurs in igneous and metamorphic rocks. Quartz spans much of Earth’s geological history; this specimen’s age and setting cannot be determined from the image.
Uses & applications
Commonly used as a decorative and lapidary material; quartz is also important in glassmaking and electronics, though this rough piece appears primarily a collector specimen.
Geological facts
Quartz is one of Earth’s most abundant minerals and can persist through extensive weathering.
Field identification & locations
Look for hardness sufficient to scratch glass, lack of cleavage, and conchoidal fracture. Milky quartz is widespread in veins and many rock types; the image alone cannot confirm the identification.
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