mineral
White milky quartz pebble
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectOpaque to translucent cream-white, with a vitreous-to-waxy luster and no obvious cleavage; hardness 7 Mohs, trigonal crystal structure, specific gravity about 2.65. The rounded shape suggests it has been naturally water-worn or tumbled.
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Physical properties
Opaque to translucent cream-white, with a vitreous-to-waxy luster and no obvious cleavage; hardness 7 Mohs, trigonal crystal structure, specific gravity about 2.65. The rounded shape suggests it has been naturally water-worn or tumbled.
Formation & geological history
Quartz forms when silica-rich fluids crystallize or when silica crystallizes from magma; this specimen’s geological age and exact source cannot be determined from the image. Quartz occurs in rocks of many ages and environments.
Uses & applications
Commonly collected, tumbled, and used for ornaments and decorative stone; quartz also has extensive industrial uses in glass, ceramics, and electronics.
Geological facts
Quartz is among Earth’s most abundant minerals and resists weathering, so it commonly accumulates in river gravels and beaches.
Field identification & locations
Look for its hardness, lack of cleavage, and glassy fracture; it can scratch ordinary glass. Common worldwide in veins, igneous and metamorphic rocks, and sediments.
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