mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, with a vitreous-to-waxy luster and no visible cleavage; hardness 7 on the Mohs scale, trigonal crystal structure, and specific gravity about 2.65. The rounded shape and smooth surface suggest natural water-worn quartz, though the photo alone cannot confirm this.
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Physical properties
White to translucent, with a vitreous-to-waxy luster and no visible cleavage; hardness 7 on the Mohs scale, trigonal crystal structure, and specific gravity about 2.65. The rounded shape and smooth surface suggest natural water-worn quartz, though the photo alone cannot confirm this.
Formation & geological history
Forms when silica-rich fluids crystallize in cracks and veins, or as quartz grains in igneous and metamorphic rocks. Quartz is widespread across Earth’s geological history; this specimen’s age and exact origin cannot be determined from the image.
Uses & applications
Used in glassmaking, electronics, and construction aggregate; attractive pieces are collected or made into simple jewelry.
Geological facts
Quartz is one of Earth’s most abundant minerals and can scratch ordinary glass.
Field identification & locations
Look for its glassy sheen, hardness, and lack of cleavage; common in veins, river gravels, and many rock types worldwide. Similar-looking calcite is softer and may fizz in dilute acid.
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