mineral
Quartz
SiO2
AI-generated identification · may be incorrectHardness 7 on the Mohs scale, typically clear or white, vitreous luster, hexagonal crystal structure, no cleavage, specific gravity of 2.65
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Physical properties
Hardness 7 on the Mohs scale, typically clear or white, vitreous luster, hexagonal crystal structure, no cleavage, specific gravity of 2.65
Formation & geological history
Forms in a wide variety of igneous, metamorphic, and sedimentary rocks. Often crystallizes from molten magma or precipitates from hot hydrothermal veins.
Uses & applications
Used extensively in glassmaking, electronics (as an oscillator), abrasives, construction materials, and as a gemstone.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust, after feldspar. It exhibits piezoelectric properties, which is why it's used in watches and radios.
Field identification & locations
Identified by its hardness (scratches glass), lack of cleavage, and typical conchoidal fracture. Found worldwide in many geological environments.
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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