mineral
Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectPale blue-white, translucent, with a smooth tumbled surface and vitreous-to-waxy luster. Hardness 7 Mohs; trigonal crystal structure, no cleavage, and specific gravity about 2.65.
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Physical properties
Pale blue-white, translucent, with a smooth tumbled surface and vitreous-to-waxy luster. Hardness 7 Mohs; trigonal crystal structure, no cleavage, and specific gravity about 2.65.
Formation & geological history
Quartz forms when silica-rich fluids crystallize in veins and cavities, and also occurs in many igneous and metamorphic rocks. Its geological age cannot be determined from the image; tumbling is human processing.
Uses & applications
Used for jewelry, beads, and decorative objects; quartz is also important in glassmaking and electronics.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly shows conchoidal fracture rather than cleavage.
Field identification & locations
Identify by its hardness, glassy luster, and lack of cleavage; common worldwide, including Brazil, Madagascar, and the United States. The rounded shape and polish indicate a tumbled specimen.
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Pegmatite with Tourmaline and Quartz
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Epidote
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Unidentified pink-and-gray mineral or rock specimen
Undetermined; the image is too blurry for reliable identification
mineral