mineral
Milky quartz pebble
Quartz (SiO₂), massive variety
AI-generated identification · may be incorrectOpaque white to gray with a vitreous-to-dull luster; hardness 7 Mohs, trigonal crystal structure, no cleavage, and conchoidal fracture. The rounded shape and gray banding suggest natural water or sediment abrasion.
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Physical properties
Opaque white to gray with a vitreous-to-dull luster; hardness 7 Mohs, trigonal crystal structure, no cleavage, and conchoidal fracture. The rounded shape and gray banding suggest natural water or sediment abrasion.
Formation & geological history
Quartz formed as silica crystallized in veins or other silica-rich settings, then weathered and rounded during transport. Quartz is common in rocks of many ages; the specimen’s specific age and source cannot be determined from the image.
Uses & applications
Quartz is used in glassmaking, construction aggregate, abrasives, and electronics; attractive pieces are collected or used decoratively.
Geological facts
Quartz is among Earth’s most abundant minerals and resists chemical weathering, allowing it to persist in sediments.
Field identification & locations
Look for hardness sufficient to scratch glass, lack of cleavage, and a glassy fracture; milky quartz occurs worldwide in veins and river or beach gravels. The image shows a rounded, likely naturally worn specimen.
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