mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: Colorless to milky white, Luster: Vitreous/Waxy, Crystal Structure: Trigonal/Hexagonal (though water-worn), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Colorless to milky white, Luster: Vitreous/Waxy, Crystal Structure: Trigonal/Hexagonal (though water-worn), Cleavage: None/Conchoidal fracture, Specific Gravity: 2.65
Formation & geological history
Formed through the crystallization of magma or from hydrothermal veins. This specific specimen has been weathered and rounded by water transport in a river or beach environment.
Uses & applications
Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative gravel or landscaping stone.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust and is highly resistant to chemical and physical weathering, which is why it often remains as pebbles after other minerals have eroded.
Field identification & locations
Identify by its ability to scratch glass and its lack of cleavage. Commonly found in riverbeds, beaches, and soil. Collectors look for clarity or smooth textures.
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Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
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metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
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