mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on the Mohs scale, yellowish-tan to light brown color due to iron oxide staining, vitreous to dull luster, sub-conchoidal fracture, smooth water-worn texture.
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Physical properties
Hardness 7 on the Mohs scale, yellowish-tan to light brown color due to iron oxide staining, vitreous to dull luster, sub-conchoidal fracture, smooth water-worn texture.
Formation & geological history
Formed via crystallization from silica-rich fluids in igneous, metamorphic, or sedimentary environments. It became rounded over time through water or wind erosion in riverbeds, streams, or coastal areas.
Uses & applications
Commonly used in landscaping, river rock gravel mixtures, aggregate for construction, and as casual pocket rocks for collectors.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Small stream-worn pebbles like this often carry iron oxide micro-coatings that give them a warm, yellowish-tan color.
Field identification & locations
Can be identified in the field by its hardness (scratches glass readily), smooth rounded appearance, lack of cleavage, and resistance to chemical weathering. Extremely common in river beds, beaches, and glacial till deposits worldwide.
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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