mineral
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to translucent, vitreous-to-waxy surface; hardness 7 Mohs, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The smooth, rounded shape suggests it has been water-worn or tumbled.
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Physical properties
White to translucent, vitreous-to-waxy surface; hardness 7 Mohs, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The smooth, rounded shape suggests it has been water-worn or tumbled.
Formation & geological history
Quartz commonly crystallizes from silica-rich fluids in veins and igneous or metamorphic rocks, then persists as a durable pebble after weathering and transport. Quartz is found in rocks of many geological ages.
Uses & applications
Commonly used for ornaments, lapidary work, and mineral collecting; quartz also has extensive industrial uses in glass and electronics.
Geological facts
Quartz is one of Earth’s most abundant minerals and fractures conchoidally rather than breaking along cleavage planes.
Field identification & locations
Identify by its glassy appearance, lack of cleavage, and ability to scratch glass; the image alone cannot confirm quartz versus another white stone. Quartz pebbles occur in river, beach, and gravel deposits worldwide.
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Mineral