mineral
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to translucent, Luster: Vitreous to greasy, Crystal structure: Hexagonal/Trigonal, cleavage: Indistinct/conchoidal fracture, Specific gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to translucent, Luster: Vitreous to greasy, Crystal structure: Hexagonal/Trigonal, cleavage: Indistinct/conchoidal fracture, Specific gravity: 2.65
Formation & geological history
Formed through hydrothermal processes, cooling of igneous magma, or precipitation from silica-rich fluids in rock cavities. Common throughout all geological ages.
Uses & applications
Used in glass manufacturing, electronics (piezoelectric properties), abrasives, and as semi-precious gemstones/jewelry.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz', which originally meant 'hard'.
Field identification & locations
Identify by its hardness (it can scratch glass), its lack of cleavage, and its characteristic waxy or glassy luster. Found globally in almost all geological environments.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Biotite Schist (Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]) — metamorphic](https://media.rock.id/9ca564b5-bc87-402b-965a-69b21f9aa6bf-thumbnail.jpg)
Biotite Schist
Biotite-rich Schist [K(Mg,Fe)3AlSi3O10(F,OH)2]
metamorphic