Mineral
Quartz
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale, Color: Clear, white (milky), or variously colored due to impurities, Luster: Vitreous (glassy), Crystal structure: Trigonal, Cleavage: None (conchoidal fracture), Specific gravity: 2.65
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Physical properties
Hardness: 7 on Mohs scale, Color: Clear, white (milky), or variously colored due to impurities, Luster: Vitreous (glassy), Crystal structure: Trigonal, Cleavage: None (conchoidal fracture), Specific gravity: 2.65
Formation & geological history
Formed in a wide variety of geological environments, primarily igneous (pegmatites, granites) and hydrothermal veins; highly resistant to weathering, making it common in sedimentary rocks (sandstone) and metamorphic rocks (quartzite).
Uses & applications
Used in glassmaking, electronics (oscillators), abrasives, construction materials, and as a gemstone.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Its piezoelectric properties make it essential for watches and electronic devices.
Field identification & locations
Identified by its hardness (scratches glass), lack of cleavage, and conchoidal fracture. Extremely common worldwide and frequently found by collectors.
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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