mineral
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectLikely opaque white quartz with a vitreous-to-waxy luster and brown surface staining or inclusions. Hardness 7 Mohs; trigonal crystal structure, no cleavage, and uneven to conchoidal fracture; specific gravity about 2.65.
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Physical properties
Likely opaque white quartz with a vitreous-to-waxy luster and brown surface staining or inclusions. Hardness 7 Mohs; trigonal crystal structure, no cleavage, and uneven to conchoidal fracture; specific gravity about 2.65.
Formation & geological history
Quartz commonly forms when silica-rich fluids crystallize in veins or cavities, and survives weathering as rounded pebbles. Its age cannot be determined from the image.
Uses & applications
Quartz is used in glassmaking, electronics, and construction; attractive pieces are collected or used decoratively.
Geological facts
Quartz is one of Earth’s most abundant minerals and resists weathering, allowing it to accumulate in stream and beach gravels.
Field identification & locations
A scratch test on glass can help identify quartz, though testing may damage the specimen; look for hardness and lack of cleavage. Common worldwide, especially in quartz veins and river gravels.
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