mineral
Tumbled quartz (likely 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. The rounded shape is mechanically polished; surface inclusions or iron staining are visible.
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Physical properties
Hardness 7 Mohs; white to translucent with a vitreous-to-waxy luster, conchoidal fracture, and no cleavage. The rounded shape is mechanically polished; surface inclusions or iron staining are visible.
Formation & geological history
Quartz crystallizes from silica-rich igneous and hydrothermal fluids, and also occurs in metamorphic veins and sedimentary rocks. Most quartz formed over broad geologic timescales, commonly millions to billions of years old.
Uses & applications
Used for ornamental tumbled stones, carvings, countertops, glass, electronics, abrasives, and ceramics; this specimen has modest lapidary or metaphysical-collecting value.
Geological facts
Milky appearance results from microscopic fluid or gas inclusions and structural defects scattering light. Quartz is one of Earth’s most abundant and chemically durable minerals.
Field identification & locations
Common worldwide, including Brazil, Madagascar, the United States, and China. Identify it by its glassy translucence, hardness, lack of cleavage, and inability to be scratched by a steel knife; a streak test is white.
