mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale, milky white to yellowish translucent color, waxy to vitreous luster, trigonal crystal system, no true cleavage, specific gravity ~2.65
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Physical properties
Hardness 7 on Mohs scale, milky white to yellowish translucent color, waxy to vitreous luster, trigonal crystal system, no true cleavage, specific gravity ~2.65
Formation & geological history
Formed in igneous pegmatites or hydrothermal veins, then eroded, transported, and rounded by water action in riverbeds, lakes, or coastal beach environments.
Uses & applications
Commonly used in landscaping, river rock decor, glassmaking raw material, aggregate, and as a popular souvenir pebble for casual collectors.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Rounded beach or river pebbles gain their smooth, oblong shape through mechanical weathering over thousands of years.
Field identification & locations
Identify by its hardness (scratches glass), lack of reaction to acid, and smooth water-worn texture. Found globally along riverbeds, streams, and beaches.
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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