mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs), Color: Clear/White/Light Gray, Luster: Vitreous to Adamantine, Crystal Structure: Trigonal (Hexagonal system), Cleavage: None, Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs), Color: Clear/White/Light Gray, Luster: Vitreous to Adamantine, Crystal Structure: Trigonal (Hexagonal system), Cleavage: None, Specific Gravity: 2.65
Formation & geological history
Forms through the crystallization of silica-rich hydrothermal fluids in rock cavities, fractures, or geodes. It can form in various igneous, metamorphic, and sedimentary environments over millions of years.
Uses & applications
Used extensively in jewelry for its sparkle, in watchmaking (quartz movement), electronics, and as a popular collector's mineral specimen.
Geological facts
The term 'druzy' refers to a coating of fine crystals on a rock fracture or surface. Quartz is the second most abundant mineral in Earth's continental crust.
Field identification & locations
Identified in the field by its crystal habit (small sparkling points), high hardness (cannot be scratched by steel), and lack of cleavage. Found globally in almost any geological setting.
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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