mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: White/Light Gray, Luster: Waxy to dull (weathered), Structure: Hexagonal/Trigonal, Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White/Light Gray, Luster: Waxy to dull (weathered), Structure: Hexagonal/Trigonal, Specific Gravity: 2.65
Formation & geological history
Formed through crystallization of silica-rich hydrothermal solutions or cooling of magma. This specific specimen has been rounded and smoothed by water erosion in a river or beach environment.
Uses & applications
Commonly used as decorative landscaping stone, in construction aggregates, or as a source for high-purity silica for glassmaking.
Geological facts
Quartz is one of the most abundant minerals in the Earth's crust and is highly resistant to chemical and physical weathering, which is why it often remains as pebbles long after other minerals have eroded.
Field identification & locations
Identified by its hardness (cannot be scratched by a steel knife) and its smooth, rounded river-worn texture. Found in gravel pits, riverbeds, and along shorelines worldwide.
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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
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary