mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale, vitreous to waxy luster, off-white to yellowish color, trigonal crystal system, no cleavage, specific gravity around 2.65.
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Physical properties
Hardness 7 on Mohs scale, vitreous to waxy luster, off-white to yellowish color, trigonal crystal system, no cleavage, specific gravity around 2.65.
Formation & geological history
Formed through weather-driven erosion and river or beach transport of quartz-bearing igneous, metamorphic, or sedimentary host rocks.
Uses & applications
Commonly used as decorative gravel, in landscaping, stream beds, or gathered as simple pebble collections.
Geological facts
Quartz is one of the most abundant minerals on Earth's continental crust and is extremely resistant to both chemical and mechanical weathering.
Field identification & locations
Found widely in riverbeds, lakeshores, and beaches worldwide. Identified by its ability to scratch glass and steel, non-cleavage fracture, and smooth rounded pebble morphology.
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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
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
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral