mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness 7 on Mohs scale, translucent to opaque brownish-tan hue, vitreous to waxy luster, trigonal crystal system, conchoidal fracture.
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Physical properties
Hardness 7 on Mohs scale, translucent to opaque brownish-tan hue, vitreous to waxy luster, trigonal crystal system, conchoidal fracture.
Formation & geological history
Formed in igneous, metamorphic, or sedimentary environments. Naturally rounded and smoothed through erosion and transport by rivers, streams, or oceans.
Uses & applications
Commonly used in landscaping, gravel, aquarium substrates, and collected as small rock specimens.
Geological facts
Quartz is one of the most abundant minerals on Earth's surface. Water-worn quartz pebbles are found worldwide in stream beds, beaches, and glacial deposits.
Field identification & locations
Identify by its hardness (scratches glass), lack of distinct cleavage, and water-rounded smooth shape. Found almost everywhere with water erosion.
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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