mineral
Quartz pebble
SiO2 (Silicon dioxide)
AI-generated identification · may be incorrectHardness: 7, Color: translucent to opaque, often white or pinkish, Luster: vitreous, Crystal structure: hexagonal, Cleavage: none, Specific gravity: 2.65
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Physical properties
Hardness: 7, Color: translucent to opaque, often white or pinkish, Luster: vitreous, Crystal structure: hexagonal, Cleavage: none, Specific gravity: 2.65
Formation & geological history
Formed from silica-rich solutions in veins or igneous rocks, later weathered and smoothed by water action in rivers or beaches.
Uses & applications
Often collected for tumbling, landscaping, or as a semiprecious stone.
Geological facts
Quartz is one of the most abundant minerals on Earth's surface. The brownish streak in this pebble is likely an iron oxide inclusion or staining.
Field identification & locations
Can be identified by its hardness (scratches glass) and conchoidal fracture. Commonly found in riverbeds, beaches, and gravel deposits.
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Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
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Septarian nodule / Concretion
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Granite
Granite (Phaneritic intrusive igneous rock)
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