mineral
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectWhite to pale gray, opaque and massive, with a vitreous to dull luster; Mohs hardness 7, no cleavage, and irregular fracture. The image shows a rounded, likely naturally worn pebble; crystal structure is trigonal, though individual crystals are not visible.
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Physical properties
White to pale gray, opaque and massive, with a vitreous to dull luster; Mohs hardness 7, no cleavage, and irregular fracture. The image shows a rounded, likely naturally worn pebble; crystal structure is trigonal, though individual crystals are not visible.
Formation & geological history
Likely formed as vein quartz when silica-rich fluids filled fractures, then weathered and rounded by transport. Quartz veins occur in rocks of many ages; the specimen’s age and precise source cannot be determined from the image.
Uses & applications
Quartz is widely used in glassmaking, electronics, and construction aggregate; attractive pieces are collected or used decoratively.
Geological facts
Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, allowing it to persist in stream and beach gravels.
Field identification & locations
Look for hardness sufficient to scratch glass, lack of cleavage, and a glassy-to-waxy broken surface; common worldwide in veins and gravel deposits. A photo alone cannot confirm the identification.
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