mineral
Quartz pebble
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, clear to milky white color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, clear to milky white color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed through crystallization from silica-rich hydrothermal solutions or cooling magma, frequently found weathered and rounded in sedimentary environments like streams and beaches.
Uses & applications
Used in glassmaking, electronics, abrasive materials, gemstone carving, and as decorative gravel.
Geological facts
Quartz is one of the most abundant and durable minerals in Earth's continental crust, able to withstand weathering that destroys other minerals.
Field identification & locations
Identified by its high hardness (scratches glass), lack of cleavage, and glassy luster. Commonly found worldwide in gravel beds, river bars, and sandy beaches.
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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
Septarian Pebble
Septarian nodule / Concretion
sedimentary