mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale, yellowish-tan to translucent color, vitreous to waxy luster, trigonal crystal system, conchoidal fracture, no distinct cleavage, specific gravity ~2.65.
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Physical properties
Hardness 7 on Mohs scale, yellowish-tan to translucent color, vitreous to waxy luster, trigonal crystal system, conchoidal fracture, no distinct cleavage, specific gravity ~2.65.
Formation & geological history
Formed in igneous, metamorphic, or sedimentary environments, then weathered, water-worn, and rounded by stream or beach action into a smooth pebble.
Uses & applications
Commonly collected as river stones, used in landscaping, decorative stone mixes, and tumbling hobbies.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. Smooth water-worn quartz pebbles are ubiquitous on riverbeds and ocean beaches worldwide.
Field identification & locations
Identify by its hardness (scratches glass easily), smooth rounded shape, lack of cleavage, and translucent tan/yellow appearance. Commonly found in gravel beds, beach sand, and riverbanks.
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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