mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectMohs hardness 7; white to translucent with a vitreous-to-waxy luster and granular or massive texture. It lacks obvious cleavage and has conchoidal fracture; crystal structure is trigonal, though tumbling has rounded the specimen.
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Physical properties
Mohs hardness 7; white to translucent with a vitreous-to-waxy luster and granular or massive texture. It lacks obvious cleavage and has conchoidal fracture; crystal structure is trigonal, though tumbling has rounded the specimen.
Formation & geological history
Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks; milky appearance results from microscopic fluid inclusions or fractures. Quartz formed throughout Earth’s geological history, commonly in Precambrian and younger veins.
Uses & applications
Used for glass, ceramics, abrasives, electronics, and countertops; attractive tumbled pieces are sold as inexpensive decorative or metaphysical stones.
Geological facts
Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, making it common in sand and river gravels.
Field identification & locations
Identify by its glassy appearance, lack of cleavage, hardness, and inability to scratch it with a steel knife while scratching ordinary glass. Common worldwide, especially in hydrothermal veins and quartz-rich rocks.
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