mineral
Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale. Color is typically white or colorless, but can vary. Luster is vitreous (glassy). Crystal structure is trigonal. Conchoidal fracture with no true cleavage. Specific gravity is 2.65.
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Physical properties
Hardness of 7 on the Mohs scale. Color is typically white or colorless, but can vary. Luster is vitreous (glassy). Crystal structure is trigonal. Conchoidal fracture with no true cleavage. Specific gravity is 2.65.
Formation & geological history
Forms in a wide variety of geological environments, including igneous, metamorphic, and sedimentary rocks. It is a common constituent of pegmatites, hydrothermal veins, and sandstones.
Uses & applications
Used widely in glassmaking, electronics, oscillators, abrasives, and as gemstones or decorative specimens in jewelry and collecting.
Geological facts
Quartz is one of the most abundant minerals found in the Earth's continental crust. Its piezoelectric properties make it useful in electronic timing devices.
Field identification & locations
Easily identified in the field by its hardness (scratches glass), conchoidal fracture, and lack of cleavage. Found worldwide in almost all rock types.
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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