mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; pale gray-white, translucent to opaque, with a vitreous-to-dull luster. Trigonal crystal structure; no cleavage, with conchoidal fracture. The rounded shape and matte surface indicate tumbling or natural water-wear.
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Physical properties
Hardness 7 Mohs; pale gray-white, translucent to opaque, with a vitreous-to-dull luster. Trigonal crystal structure; no cleavage, with conchoidal fracture. The rounded shape and matte surface indicate tumbling or natural water-wear.
Formation & geological history
Quartz forms when silica-rich fluids crystallize in veins and cavities, or in igneous and metamorphic rocks; it is among Earth’s most abundant minerals and occurs across many geological ages.
Uses & applications
Commonly used for inexpensive jewelry, décor, and lapidary practice; quartz also has major industrial uses in glass, electronics, and abrasives.
Geological facts
Quartz is resistant to weathering, so rounded quartz pebbles are common in river and beach deposits.
Field identification & locations
Identify it by its hardness, lack of cleavage, and glassy or waxy appearance; it should scratch ordinary glass. Quartz occurs worldwide, but the image alone cannot confirm the exact variety or source.
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Undetermined; the image is too blurry for reliable identification
mineral