mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to milky translucent, Luster: Vitreous/Glassy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to milky translucent, Luster: Vitreous/Glassy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed from cooling magma or hydrothermal veins, later weathered and water-worn into a smooth pebble in riverbeds or coastal environments. Quartz is found in almost all geological ages.
Uses & applications
Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative river stone in landscaping.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. This specific specimen appears to be 'Milky Quartz,' which gets its white color from tiny fluid inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identify by its ability to scratch glass and lack of cleavage. Look for smooth, rounded shapes in riverbeds or beaches where water has eroded the parent rock.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
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Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
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Epidote
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