mineral
Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, clear or transparent color (Rock Crystal), vitreous (glassy) luster, hexagonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, clear or transparent color (Rock Crystal), vitreous (glassy) luster, hexagonal crystal system, conchoidal fracture with no true cleavage, and a specific gravity of 2.65.
Formation & geological history
Formed in a wide variety of geological environments, most commonly crystallized from silica-rich hydrothermal veins, pegmatites, and as a primary component of igneous, metamorphic, and sedimentary rocks.
Uses & applications
Used widely in electronics (oscillators, quartz clocks), glassmaking, abrasives, gemstones, and ornamental carvings.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust, surpassed only by feldspar. It exhibits piezoelectric properties, meaning it can generate an electrical charge in response to mechanical stress.
Field identification & locations
Easily identified by its distinct hexagonal prism crystal habit, high hardness (scratches glass easily), and lack of cleavage. Found globally, with notable deposits in Brazil, the USA, Madagascar, and the Alps.
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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