mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; white to translucent with a vitreous-to-waxy luster, conchoidal fracture, and no cleavage. Crystalline structure is trigonal, though the small polished piece appears massive rather than visibly crystalline.
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Physical properties
Hardness 7 Mohs; white to translucent with a vitreous-to-waxy luster, conchoidal fracture, and no cleavage. Crystalline structure is trigonal, though the small polished piece appears massive rather than visibly crystalline.
Formation & geological history
Forms when silica-rich fluids precipitate in veins, cavities, and igneous or metamorphic rocks; milky appearance comes from microscopic fluid inclusions or fractures. Quartz is common from Precambrian to modern geological settings.
Uses & applications
Used for decorative stones, abrasives, glass and ceramics, electronics, and jewelry; this specimen is primarily a low-cost polished collectible.
Geological facts
Quartz is one of Earth’s most abundant minerals and is piezoelectric, generating an electrical charge under pressure.
Field identification & locations
Identify by its glassy luster, lack of cleavage, hardness sufficient to scratch ordinary glass, and white translucent appearance. Common worldwide, especially in hydrothermal veins and granitic terrains.