mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically white to cream, translucent, with a vitreous-to-waxy luster and no cleavage; Mohs hardness 7, trigonal crystal structure, and specific gravity about 2.65. The rounded shape indicates human tumbling or water wear.
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Physical properties
Typically white to cream, translucent, with a vitreous-to-waxy luster and no cleavage; Mohs hardness 7, trigonal crystal structure, and specific gravity about 2.65. The rounded shape indicates human tumbling or water wear.
Formation & geological history
Forms in silica-rich veins, cavities, and igneous or metamorphic rocks when silica-bearing fluids crystallize; quartz is common from Precambrian to modern geological settings. The cloudy appearance comes from microscopic fluid inclusions or structural defects.
Uses & applications
Used as an inexpensive decorative, lapidary, and metaphysical stone; quartz is also important industrially in glass, ceramics, electronics, and abrasives.
Geological facts
Quartz has excellent scratch resistance but can fracture conchoidally; it scratches ordinary glass but not topaz or corundum.
Field identification & locations
Identify by its hardness, glassy luster, lack of cleavage, and conchoidal fracture; common worldwide, especially in hydrothermal veins and pegmatites. This specimen appears polished/tumbled rather than raw.
