mineral
Likely quartz-rich pebble
Quartz (SiO₂), possibly iron-stained milky quartz or quartzite
AI-generated identification · may be incorrectHardness about 7 Mohs; white to translucent with orange-brown iron-oxide staining, vitreous to dull luster, and no obvious cleavage. The rounded shape suggests natural abrasion or tumbling; exact identification is limited by the image.
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Physical properties
Hardness about 7 Mohs; white to translucent with orange-brown iron-oxide staining, vitreous to dull luster, and no obvious cleavage. The rounded shape suggests natural abrasion or tumbling; exact identification is limited by the image.
Formation & geological history
Quartz crystallizes from silica-rich fluids or igneous melts; quartzite forms when sandstone is metamorphosed. The specimen’s geological age cannot be determined visually, and its rounded form likely reflects stream or beach transport.
Uses & applications
Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive pieces may be 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 as rounded pebbles after softer minerals erode.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch ordinary glass, and absence of cleavage; a steel nail should not scratch it. Common sources include river gravels, beaches, quartz veins, and quartzite outcrops.
