mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to off-white/cream, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to off-white/cream, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (trigonal), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65
Formation & geological history
Formed from molten magma or hydrothermal veins. This specific specimen is a water-rounded pebble, likely shaped by thousand of years in a riverbed or coastal environment through mechanical erosion.
Uses & applications
Used in glassmaking, electronics (piezoelectric properties), various abrasives, landscaping, and construction aggregates.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it often survives as pebbles long after surrounding rocks have crumbled.
Field identification & locations
Identify in the field by its ability to scratch glass and lack of cleavage. Commonly found in riverbeds, beaches, and soil worldwide. It is a universal find for rock collectors.
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