mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectPale blue-white, translucent to cloudy, with a vitreous-to-waxy polish; Mohs hardness 7, trigonal crystal structure, no true cleavage, and specific gravity about 2.65. The smooth oval shape indicates tumbling or polishing.
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Physical properties
Pale blue-white, translucent to cloudy, with a vitreous-to-waxy polish; Mohs hardness 7, trigonal crystal structure, no true cleavage, and specific gravity about 2.65. The smooth oval shape indicates tumbling or polishing.
Formation & geological history
Quartz commonly crystallizes from silica-rich fluids in veins and cavities, or forms in igneous and metamorphic rocks. Its age depends on its source; the image alone cannot establish it.
Uses & applications
Used for inexpensive jewelry, ornaments, décor, and mineral collections; quartz is also important in glassmaking and electronics.
Geological facts
Quartz is one of Earth’s most abundant minerals. This specimen may be milky quartz, though a photograph cannot rule out another pale, tumbled mineral.
Field identification & locations
Look for hardness near 7, glass that it can scratch, and a white streak; quartz occurs worldwide in veins and many rock types. Similar-looking pale stones can be distinguished with hardness and specific-gravity tests.
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