sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale, Color: White to off-white, Luster: Vitreous to dull due to weathering, Crystal Structure: Trigonal (microcrystalline or massive in pebble form), Cleavage: None, Specific Gravity: 2.65
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Physical properties
Hardness: 7 on Mohs scale, Color: White to off-white, Luster: Vitreous to dull due to weathering, Crystal Structure: Trigonal (microcrystalline or massive in pebble form), Cleavage: None, Specific Gravity: 2.65
Formation & geological history
Formed through the mechanical weathering and water transport of larger quartz veins or rocks, smoothing out rough edges in riverbeds or marine environments over thousands to millions of years.
Uses & applications
Used in landscaping, decorative gravel, historical stone tools, and as aggregate in construction.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. Its high resistance to both chemical and physical weathering allows quartz pebbles to survive long journeys in river systems where other rocks break down.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), lack of cleavage, and smooth, rounded water-worn shape. Commonly found in stream beds, beaches, and alluvial gravel deposits worldwide.
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Quartz pebble
Silicon dioxide (SiO2)
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