mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs), Color: Off-white/tan, Luster: Vitreous to waxy (when water-worn), Crystal Structure: Hexagonal (trigonal), Cleavage: None/Conchoidal
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Physical properties
Hardness: 7 (Mohs), Color: Off-white/tan, Luster: Vitreous to waxy (when water-worn), Crystal Structure: Hexagonal (trigonal), Cleavage: None/Conchoidal
Formation & geological history
Formed via crystallization from magma or hydrothermal activity; later weathered into a pebble by fluvial or coastal erosion. Common in all geological eras.
Uses & applications
Industrial use in glassmaking, abrasives, and as a durable component in concrete and construction aggregates.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. These small pebbles are often referred to as 'river stones' or 'beach pebbles' depending on where they are found.
Field identification & locations
Identify by its inability to be scratched by steel and its lack of cleavage. Commonly found in riverbeds, beaches, and glacial till.
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Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
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Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous