mineral
Likely milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectOpaque white to pale gray, with a vitreous-to-dull luster and irregular fracture; quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65. The image suggests a water-worn pebble, but its identity cannot be confirmed from appearance alone.
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Physical properties
Opaque white to pale gray, with a vitreous-to-dull luster and irregular fracture; quartz has Mohs hardness 7, a trigonal crystal structure, no cleavage, and specific gravity about 2.65. The image suggests a water-worn pebble, but its identity cannot be confirmed from appearance alone.
Formation & geological history
Quartz forms in many igneous, metamorphic, and sedimentary settings, including veins and pegmatites; this pebble was likely rounded by transport in water. Its age is indeterminate from the photograph.
Uses & applications
Quartz is used in glass, electronics, and construction aggregate; attractive specimens may be collected or used decoratively.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly survives erosion because it is relatively hard and chemically durable.
Field identification & locations
Look for hardness sufficient to scratch glass, lack of cleavage, and a white streak; common worldwide in river and beach gravels. A small common pebble typically has little commercial value.
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