mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: tan to milky white, Luster: Vitreous/waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None/Conchoidal fracture, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: tan to milky white, Luster: Vitreous/waxy, Crystal structure: Hexagonal (trigonal), Cleavage: None/Conchoidal fracture, Specific gravity: 2.65
Formation & geological history
Formed through the cooling of silica-rich magma or precipitation from hydrothermal veins; this specific specimen has been rounded by fluvial (water) erosion or glacial movement.
Uses & applications
Industrial uses include glassmaking and electronics; as a common pebble, it is often used in landscaping or construction aggregate.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. These rounded pebbles are often referred to as 'river rocks' and can survive billions of years due to their chemical stability.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and glacial till 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
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