sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, typically white, milky, or pale pinkish color, vitreous to greasy luster, hexagonal crystal system when in crystal form, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, typically white, milky, or pale pinkish color, vitreous to greasy luster, hexagonal crystal system when in crystal form, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through weathering and water transport of quartz veins or granitic rocks, where softer minerals are eroded away leaving durable quartz pebbles in rivers and beaches.
Uses & applications
Used in landscaping, decorative stone, abrasive production, and occasionally lapidary work.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering and chemical breakdown.
Field identification & locations
Can be easily identified by its high hardness (scratches glass), lack of cleavage, and smooth water-worn shape found frequently in riverbeds and gravel bars.
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