mineral
Tumbled milky quartz
Quartz (SiO₂), microcrystalline or massive variety
AI-generated identification · may be incorrectTypically Mohs hardness 7, white to translucent with a vitreous-to-waxy luster, conchoidal fracture, and no cleavage; trigonal crystal structure, though individual crystals are not visible. The rounded surface indicates mechanical tumbling and polishing.
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Physical properties
Typically Mohs hardness 7, white to translucent with a vitreous-to-waxy luster, conchoidal fracture, and no cleavage; trigonal crystal structure, though individual crystals are not visible. The rounded surface indicates mechanical tumbling and polishing.
Formation & geological history
Forms when silica-rich fluids crystallize in veins, cavities, or igneous and metamorphic rocks; most specimens are geologically ancient, commonly Paleozoic or older. The pictured piece is human-processed rather than naturally rounded.
Uses & applications
Commonly sold as a low-cost lapidary, craft, meditation, and decorative stone; occasionally used for beads and cabochons. It is not typically valuable as a gemstone because the milky appearance is widespread.
Geological facts
Its cloudiness results from microscopic fluid inclusions, fractures, or structural defects. Quartz is one of Earth’s most abundant minerals and is a major component of granite, sandstone, and many metamorphic rocks.
Field identification & locations
Identify it by its white translucence, glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage; it should not fizz in dilute acid. Common sources include Brazil, Madagascar, India, and the United States.
