mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: Colorless/Transparent, Luster: Vitreous/Glassy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: Colorless/Transparent, Luster: Vitreous/Glassy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Forms in igneous, metamorphic, and sedimentary environments through the cooling of silica-rich magma or from hydrothermal veins. Found worldwide in geological ages ranging from Precambrian to recent.
Uses & applications
Used in electronics (oscillators), manufacturing of glass and ceramics, jewelry (gemstones), and as decorative/healing crystal specimens.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge when mechanical stress is applied.
Field identification & locations
Identify by its hexagonal point, hardness (can scratch glass), and lack of cleavage. Common locations include Brazil, USA (Arkansas), and Madagascar.
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Nephrite Jade
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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