mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectLikely hardness 7 on the Mohs scale, translucent white to cream, with a vitreous-to-waxy luster and no visible cleavage. The smooth rounded shape indicates tumbling and polishing; exact identification is limited by the image.
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Physical properties
Likely hardness 7 on the Mohs scale, translucent white to cream, with a vitreous-to-waxy luster and no visible cleavage. The smooth rounded shape indicates tumbling and polishing; exact identification is limited by the image.
Formation & geological history
Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; milky quartz commonly forms in veins due to microscopic fluid inclusions. Quartz ranges from ancient Precambrian rocks to geologically recent deposits.
Uses & applications
Used as an inexpensive ornamental stone, craft material, and collectible; quartz is also important in glass, ceramics, electronics, and engineered stone.
Geological facts
Quartz is one of Earth’s most abundant minerals and has a characteristic conchoidal fracture. Its white cloudiness commonly results from trapped microscopic fluids or fractures.
Field identification & locations
Test with a steel file or knife cautiously: quartz should resist scratching; it can scratch ordinary glass. Common sources include Brazil, Madagascar, the United States, and quartz veins worldwide.
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