mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 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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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous