mineral
Quartz Pebble
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale), Color: White to translucent/milky, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to translucent/milky, Luster: Vitreous to waxy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed from silica-rich hydrothermal systems or igneous intrusions; this specific specimen is a water-worn river pebble, likely polished by alluvial erosion over thousands of years.
Uses & applications
Used in glassmaking, grit for abrasives, as decorative landscaping stone, and occasionally in jewelry for cabochons or tumbled stones.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electrical charge when mechanical pressure is applied.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of cleavage. Look for smooth, rounded textures in riverbeds, beaches, or glacial till deposits.
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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
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