mineral
Quartz fragment
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous to greasy luster, hexagonal crystal structure when fully formed, milky white to yellowish-tan color with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous to greasy luster, hexagonal crystal structure when fully formed, milky white to yellowish-tan color with conchoidal fracture.
Formation & geological history
Formed in igneous, metamorphic, and sedimentary environments, crystallizing from magma or precipitating from hydrothermal fluids.
Uses & applications
Used in glassmaking, electronics, abrasives, construction aggregates, and as decorative gravel or mineral specimens.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust after feldspar, and it resists chemical and physical weathering extremely well.
Field identification & locations
Identified by its high hardness (scratches glass, cannot be scratched by steel), lack of prominent cleavage, and glossy glassy fracture surfaces. Extremely common worldwide.
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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
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral