mineral
Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectMohs hardness 7; translucent white to pale lavender with a vitreous-to-waxy polish. Trigonal crystal structure; no cleavage, with conchoidal fracture. The rounded shape indicates it has been tumbled or polished.
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Physical properties
Mohs hardness 7; translucent white to pale lavender with a vitreous-to-waxy polish. Trigonal crystal structure; no cleavage, with conchoidal fracture. The rounded shape indicates it has been tumbled or polished.
Formation & geological history
Quartz forms in igneous and metamorphic rocks and in hydrothermal veins; this specimen’s precise age and source cannot be determined from the image.
Uses & applications
Commonly used for inexpensive jewelry, ornaments, and mineral collections; quartz is also important in glassmaking and electronics.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly occurs in many colors due to inclusions or trace impurities.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage. Quartz occurs worldwide; a small polished piece like this typically sells for about $1–$10.
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