mineral
Milky quartz pebble
Quartz, silicon dioxide (SiO₂)
AI-generated identification · may be incorrectWhite to translucent, vitreous-to-dull luster; Mohs hardness 7, no cleavage, conchoidal fracture, and trigonal crystal structure. The rounded shape and surface wear suggest a water-worn pebble; identification from the image is tentative.
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Physical properties
White to translucent, vitreous-to-dull luster; Mohs hardness 7, no cleavage, conchoidal fracture, and trigonal crystal structure. The rounded shape and surface wear suggest a water-worn pebble; identification from the image is tentative.
Formation & geological history
Quartz formed as silica crystallized in veins or igneous and metamorphic rocks, then was released by weathering and rounded during transport. Quartz occurs in rocks of many geological ages.
Uses & applications
Quartz is widely used in glass, electronics, abrasives, and construction; attractive pieces may be collected or used in crafts.
Geological facts
Quartz is one of Earth’s most abundant minerals and is resistant to weathering, so it commonly persists as stream and beach pebbles.
Field identification & locations
Look for hardness—quartz can scratch glass—and its lack of cleavage; milky quartz is common worldwide in veins, river gravels, and glacial deposits. A small rounded pebble alone is difficult to identify definitively.
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Granite
Granite (Phaneritic intrusive igneous rock)
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